diff --git a/Gopkg.lock b/Gopkg.lock
new file mode 100644
index 0000000..d3be0b9
--- /dev/null
+++ b/Gopkg.lock
@@ -0,0 +1,48 @@
+# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
+
+
+[[projects]]
+  name = "github.com/BurntSushi/toml"
+  packages = ["."]
+  revision = "99064174e013895bbd9b025c31100bd1d9b590ca"
+  version = "v0.3.0"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/armon/go-radix"
+  packages = ["."]
+  revision = "4239b77079c7b5d1243b7b4736304ce8ddb6f0f2"
+
+[[projects]]
+  name = "github.com/bgentry/speakeasy"
+  packages = ["."]
+  revision = "a1ccbf2c40dfc8ce514b5c5c6e6d1429ea6880da"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/jsimonetti/pwscheme"
+  packages = ["ssha"]
+  revision = "76804708ecad54773871b35dbaa44f517973e395"
+
+[[projects]]
+  name = "github.com/mattn/go-isatty"
+  packages = ["."]
+  revision = "66b8e73f3f5cda9f96b69efd03dd3d7fc4a5cdb8"
+
+[[projects]]
+  branch = "master"
+  name = "github.com/mitchellh/cli"
+  packages = ["."]
+  revision = "fcf521421aa29bde1d93b6920dfce826d7932208"
+
+[[projects]]
+  name = "golang.org/x/sys"
+  packages = ["unix"]
+  revision = "8f0908ab3b2457e2e15403d3697c9ef5cb4b57a9"
+
+[solve-meta]
+  analyzer-name = "dep"
+  analyzer-version = 1
+  inputs-digest = "d88d2668ae10b500606e3ebb1e719897e62e423f5ede8e4b470d12c1d255fe31"
+  solver-name = "gps-cdcl"
+  solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
new file mode 100644
index 0000000..e69de29
diff --git a/Makefile b/Makefile
index 2e0bb08..407c5ef 100644
--- a/Makefile
+++ b/Makefile
@@ -1,29 +1,42 @@
 GOVERSION=$(shell go version)
-GOOS=$(word 1,$(subst /, ,$(lastword $(GOVERSION))))
-GOARCH=$(word 2,$(subst /, ,$(lastword $(GOVERSION))))
+THIS_GOOS=$(word 1,$(subst /, ,$(lastword $(GOVERSION))))
+THIS_GOARCH=$(word 2,$(subst /, ,$(lastword $(GOVERSION))))
+GOOS?=$(THIS_GOOS)
+GOARCH?=$(THIS_GOARCH)
+DIR_PKG=$(subst /src/github.com/directorz/mailfull-go,/pkg,$(PWD))
 DIR_BUILD=build
 DIR_RELEASE=release
 VERSION=$(patsubst "%",%,$(lastword $(shell grep 'const Version' version.go)))
+GITTAG=$(shell git rev-parse --short HEAD)
 
 .PHONY: build build-linux-amd64 build-linux-386 clean
 
 default: build
 
-installdeps:
-	glide install -v
+$(DIR_BUILD)/bin/$(THIS_GOOS)_$(THIS_GOARCH)/dep:
+	mkdir -p /tmp/go
+	GOPATH=/tmp/go go get -d -v github.com/golang/dep
+	GOPATH=/tmp/go go build -v -o $(DIR_BUILD)/bin/$(THIS_GOOS)_$(THIS_GOARCH)/dep github.com/golang/dep/cmd/dep
+	rm -rf /tmp/go
+
+dep: $(DIR_BUILD)/bin/$(THIS_GOOS)_$(THIS_GOARCH)/dep
+
+installdeps: dep
+	$(DIR_BUILD)/bin/$(THIS_GOOS)_$(THIS_GOARCH)/dep ensure -v
 
 build:
-	go build -v -ldflags "-X main.gittag=`git rev-parse --short HEAD`" -o build/mailfull_$(GOOS)_$(GOARCH)/mailfull cmd/mailfull/mailfull.go
+	go build -v -i -ldflags "-X main.gittag=$(GITTAG)" -o $(DIR_BUILD)/mailfull_$(GOOS)_$(GOARCH)/mailfull cmd/mailfull/*.go
+
+.build-docker:
+	docker run --rm -v $(DIR_PKG):/go/pkg -v $(PWD):/go/src/github.com/directorz/mailfull-go -w /go/src/github.com/directorz/mailfull-go \
+	-e GOOS=$(GOOS) -e GOARCH=$(GOARCH) golang:1.8.3 \
+	go build -v -i -ldflags "-X main.gittag=$(GITTAG)" -o $(DIR_BUILD)/mailfull_$(GOOS)_$(GOARCH)/mailfull cmd/mailfull/*.go
 
 build-linux-amd64:
-	docker run --rm -v $(PWD):/go/src/github.com/directorz/mailfull-go -w /go/src/github.com/directorz/mailfull-go \
-	-e GOOS=linux -e GOARCH=amd64 golang:1.7.4 \
-	go build -v -ldflags "-X main.gittag=`git rev-parse --short HEAD`" -o "build/mailfull_linux_amd64/mailfull" cmd/mailfull/mailfull.go
+	@$(MAKE) .build-docker GOOS=linux GOARCH=amd64
 
 build-linux-386:
-	docker run --rm -v $(PWD):/go/src/github.com/directorz/mailfull-go -w /go/src/github.com/directorz/mailfull-go \
-	-e GOOS=linux -e GOARCH=386 golang:1.7.4 \
-	go build -v -ldflags "-X main.gittag=`git rev-parse --short HEAD`" -o "build/mailfull_linux_386/mailfull" cmd/mailfull/mailfull.go
+	@$(MAKE) .build-docker GOOS=linux GOARCH=386
 
 release: release-linux-amd64 release-linux-386
 
diff --git a/aliasdomain.go b/aliasdomain.go
index b1fc2f7..4563f0b 100644
--- a/aliasdomain.go
+++ b/aliasdomain.go
@@ -15,13 +15,6 @@ type AliasDomain struct {
 	target string
 }
 
-// AliasDomainSlice attaches the methods of sort.Interface to []*AliasDomain.
-type AliasDomainSlice []*AliasDomain
-
-func (p AliasDomainSlice) Len() int           { return len(p) }
-func (p AliasDomainSlice) Less(i, j int) bool { return p[i].Name() < p[j].Name() }
-func (p AliasDomainSlice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
-
 // NewAliasDomain creates a new AliasDomain instance.
 func NewAliasDomain(name, target string) (*AliasDomain, error) {
 	ad := &AliasDomain{}
@@ -190,7 +183,7 @@ func (r *Repository) writeAliasDomainsFile(aliasDomains []*AliasDomain) error {
 	}
 	defer file.Close()
 
-	sort.Sort(AliasDomainSlice(aliasDomains))
+	sort.Slice(aliasDomains, func(i, j int) bool { return aliasDomains[i].Name() < aliasDomains[j].Name() })
 
 	for _, aliasDomain := range aliasDomains {
 		if _, err := fmt.Fprintf(file, "%s:%s\n", aliasDomain.Name(), aliasDomain.Target()); err != nil {
diff --git a/aliasuser.go b/aliasuser.go
index 647bcfe..cd9d66c 100644
--- a/aliasuser.go
+++ b/aliasuser.go
@@ -21,13 +21,6 @@ type AliasUser struct {
 	targets []string
 }
 
-// AliasUserSlice attaches the methods of sort.Interface to []*AliasUser.
-type AliasUserSlice []*AliasUser
-
-func (p AliasUserSlice) Len() int           { return len(p) }
-func (p AliasUserSlice) Less(i, j int) bool { return p[i].Name() < p[j].Name() }
-func (p AliasUserSlice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
-
 // NewAliasUser creates a new AliasUser instance.
 func NewAliasUser(name string, targets []string) (*AliasUser, error) {
 	au := &AliasUser{}
@@ -233,7 +226,7 @@ func (r *Repository) writeAliasUsersFile(domainName string, aliasUsers []*AliasU
 	}
 	defer file.Close()
 
-	sort.Sort(AliasUserSlice(aliasUsers))
+	sort.Slice(aliasUsers, func(i, j int) bool { return aliasUsers[i].Name() < aliasUsers[j].Name() })
 
 	for _, aliasUser := range aliasUsers {
 		if _, err := fmt.Fprintf(file, "%s:%s\n", aliasUser.Name(), strings.Join(aliasUser.Targets(), ",")); err != nil {
diff --git a/cmd/mailfull/command/aliasdomainadd.go b/cmd/mailfull/cmd_aliasdomainadd.go
similarity index 61%
rename from cmd/mailfull/command/aliasdomainadd.go
rename to cmd/mailfull/cmd_aliasdomainadd.go
index 2eb90d5..d7b51e1 100644
--- a/cmd/mailfull/command/aliasdomainadd.go
+++ b/cmd/mailfull/cmd_aliasdomainadd.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
-	mailfull "github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// AliasDomainAddCommand represents a AliasDomainAddCommand.
-type AliasDomainAddCommand struct {
-	Meta
+// CmdAliasDomainAdd represents a CmdAliasDomainAdd.
+type CmdAliasDomainAdd struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *AliasDomainAddCommand) Synopsis() string {
+func (c *CmdAliasDomainAdd) Synopsis() string {
 	return "Create a new aliasdomain."
 }
 
 // Help returns long-form help text.
-func (c *AliasDomainAddCommand) Help() string {
+func (c *CmdAliasDomainAdd) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain target
@@ -42,7 +43,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *AliasDomainAddCommand) Run(args []string) int {
+func (c *CmdAliasDomainAdd) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -59,34 +60,26 @@ func (c *AliasDomainAddCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	aliasDomain, err := mailfull.NewAliasDomain(aliasDomainName, targetDomainName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.AliasDomainCreate(aliasDomain); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/aliasdomaindel.go b/cmd/mailfull/cmd_aliasdomaindel.go
similarity index 58%
rename from cmd/mailfull/command/aliasdomaindel.go
rename to cmd/mailfull/cmd_aliasdomaindel.go
index 1310f93..370dcfc 100644
--- a/cmd/mailfull/command/aliasdomaindel.go
+++ b/cmd/mailfull/cmd_aliasdomaindel.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
-	mailfull "github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// AliasDomainDelCommand represents a AliasDomainDelCommand.
-type AliasDomainDelCommand struct {
-	Meta
+// CmdAliasDomainDel represents a CmdAliasDomainDel.
+type CmdAliasDomainDel struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *AliasDomainDelCommand) Synopsis() string {
+func (c *CmdAliasDomainDel) Synopsis() string {
 	return "Delete a aliasdomain."
 }
 
 // Help returns long-form help text.
-func (c *AliasDomainDelCommand) Help() string {
+func (c *CmdAliasDomainDel) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain
@@ -40,7 +41,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *AliasDomainDelCommand) Run(args []string) int {
+func (c *CmdAliasDomainDel) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -56,28 +57,20 @@ func (c *AliasDomainDelCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.AliasDomainRemove(aliasDomainName); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/aliasdomains.go b/cmd/mailfull/cmd_aliasdomains.go
similarity index 67%
rename from cmd/mailfull/command/aliasdomains.go
rename to cmd/mailfull/cmd_aliasdomains.go
index 62cbac7..43a07fe 100644
--- a/cmd/mailfull/command/aliasdomains.go
+++ b/cmd/mailfull/cmd_aliasdomains.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"sort"
 
-	mailfull "github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// AliasDomainsCommand represents a AliasDomainsCommand.
-type AliasDomainsCommand struct {
-	Meta
+// CmdAliasDomains represents a CmdAliasDomains.
+type CmdAliasDomains struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *AliasDomainsCommand) Synopsis() string {
+func (c *CmdAliasDomains) Synopsis() string {
 	return "Show aliasdomains."
 }
 
 // Help returns long-form help text.
-func (c *AliasDomainsCommand) Help() string {
+func (c *CmdAliasDomains) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [domain]
@@ -37,7 +38,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *AliasDomainsCommand) Run(args []string) int {
+func (c *CmdAliasDomains) Run(args []string) int {
 	if len(args) > 1 {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
 		return 1
@@ -50,16 +51,16 @@ func (c *AliasDomainsCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	aliasDomains, err := repo.AliasDomains()
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
-	sort.Sort(mailfull.AliasDomainSlice(aliasDomains))
+	sort.Slice(aliasDomains, func(i, j int) bool { return aliasDomains[i].Name() < aliasDomains[j].Name() })
 
 	for _, aliasDomain := range aliasDomains {
 		if targetDomainName != "" {
diff --git a/cmd/mailfull/command/aliasuseradd.go b/cmd/mailfull/cmd_aliasuseradd.go
similarity index 64%
rename from cmd/mailfull/command/aliasuseradd.go
rename to cmd/mailfull/cmd_aliasuseradd.go
index 9d6ee93..edef4c6 100644
--- a/cmd/mailfull/command/aliasuseradd.go
+++ b/cmd/mailfull/cmd_aliasuseradd.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"strings"
 
-	mailfull "github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// AliasUserAddCommand represents a AliasUserAddCommand.
-type AliasUserAddCommand struct {
-	Meta
+// CmdAliasUserAdd represents a CmdAliasUserAdd.
+type CmdAliasUserAdd struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *AliasUserAddCommand) Synopsis() string {
+func (c *CmdAliasUserAdd) Synopsis() string {
 	return "Create a new aliasuser."
 }
 
 // Help returns long-form help text.
-func (c *AliasUserAddCommand) Help() string {
+func (c *CmdAliasUserAdd) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] address target [target...]
@@ -43,7 +44,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *AliasUserAddCommand) Run(args []string) int {
+func (c *CmdAliasUserAdd) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -68,34 +69,26 @@ func (c *AliasUserAddCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	aliasUser, err := mailfull.NewAliasUser(aliasUserName, targets)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.AliasUserCreate(domainName, aliasUser); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/aliasuserdel.go b/cmd/mailfull/cmd_aliasuserdel.go
similarity index 63%
rename from cmd/mailfull/command/aliasuserdel.go
rename to cmd/mailfull/cmd_aliasuserdel.go
index 0eb5d12..56dc398 100644
--- a/cmd/mailfull/command/aliasuserdel.go
+++ b/cmd/mailfull/cmd_aliasuserdel.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"strings"
 
-	mailfull "github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// AliasUserDelCommand represents a AliasUserDelCommand.
-type AliasUserDelCommand struct {
-	Meta
+// CmdAliasUserDel represents a CmdAliasUserDel.
+type CmdAliasUserDel struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *AliasUserDelCommand) Synopsis() string {
+func (c *CmdAliasUserDel) Synopsis() string {
 	return "Delete a aliasuser."
 }
 
 // Help returns long-form help text.
-func (c *AliasUserDelCommand) Help() string {
+func (c *CmdAliasUserDel) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] address
@@ -41,7 +42,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *AliasUserDelCommand) Run(args []string) int {
+func (c *CmdAliasUserDel) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -64,28 +65,20 @@ func (c *AliasUserDelCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.AliasUserRemove(domainName, aliasUserName); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/aliasusermod.go b/cmd/mailfull/cmd_aliasusermod.go
similarity index 62%
rename from cmd/mailfull/command/aliasusermod.go
rename to cmd/mailfull/cmd_aliasusermod.go
index 459cd67..5081138 100644
--- a/cmd/mailfull/command/aliasusermod.go
+++ b/cmd/mailfull/cmd_aliasusermod.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"strings"
 
-	mailfull "github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// AliasUserModCommand represents a AliasUserModCommand.
-type AliasUserModCommand struct {
-	Meta
+// CmdAliasUserMod represents a CmdAliasUserMod.
+type CmdAliasUserMod struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *AliasUserModCommand) Synopsis() string {
+func (c *CmdAliasUserMod) Synopsis() string {
 	return "Modify a aliasuser."
 }
 
 // Help returns long-form help text.
-func (c *AliasUserModCommand) Help() string {
+func (c *CmdAliasUserMod) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] address target [target...]
@@ -43,7 +44,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *AliasUserModCommand) Run(args []string) int {
+func (c *CmdAliasUserMod) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -68,43 +69,35 @@ func (c *AliasUserModCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	aliasUser, err := repo.AliasUser(domainName, aliasUserName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 	if aliasUser == nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", mailfull.ErrAliasUserNotExist)
+		c.Meta.Errorf("%v\n", mailfull.ErrAliasUserNotExist)
 		return 1
 	}
 
 	if err := aliasUser.SetTargets(targets); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.AliasUserUpdate(domainName, aliasUser); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/aliasusers.go b/cmd/mailfull/cmd_aliasusers.go
similarity index 65%
rename from cmd/mailfull/command/aliasusers.go
rename to cmd/mailfull/cmd_aliasusers.go
index 036b23a..c153994 100644
--- a/cmd/mailfull/command/aliasusers.go
+++ b/cmd/mailfull/cmd_aliasusers.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"sort"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// AliasUsersCommand represents a AliasUsersCommand.
-type AliasUsersCommand struct {
-	Meta
+// CmdAliasUsers represents a CmdAliasUsers.
+type CmdAliasUsers struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *AliasUsersCommand) Synopsis() string {
+func (c *CmdAliasUsers) Synopsis() string {
 	return "Show aliasusers."
 }
 
 // Help returns long-form help text.
-func (c *AliasUsersCommand) Help() string {
+func (c *CmdAliasUsers) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s domain
@@ -37,7 +38,7 @@ Required Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *AliasUsersCommand) Run(args []string) int {
+func (c *CmdAliasUsers) Run(args []string) int {
 	if len(args) != 1 {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
 		return 1
@@ -47,16 +48,16 @@ func (c *AliasUsersCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	aliasUsers, err := repo.AliasUsers(targetDomainName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
-	sort.Sort(mailfull.AliasUserSlice(aliasUsers))
+	sort.Slice(aliasUsers, func(i, j int) bool { return aliasUsers[i].Name() < aliasUsers[j].Name() })
 
 	for _, aliasUser := range aliasUsers {
 		fmt.Fprintf(c.UI.Writer, "%s\n", aliasUser.Name())
diff --git a/cmd/mailfull/command/catchall.go b/cmd/mailfull/cmd_catchall.go
similarity index 69%
rename from cmd/mailfull/command/catchall.go
rename to cmd/mailfull/cmd_catchall.go
index 3c1db48..43615a3 100644
--- a/cmd/mailfull/command/catchall.go
+++ b/cmd/mailfull/cmd_catchall.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// CatchAllCommand represents a CatchAllCommand.
-type CatchAllCommand struct {
-	Meta
+// CmdCatchAll represents a CmdCatchAll.
+type CmdCatchAll struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *CatchAllCommand) Synopsis() string {
+func (c *CmdCatchAll) Synopsis() string {
 	return "Show a catchall user."
 }
 
 // Help returns long-form help text.
-func (c *CatchAllCommand) Help() string {
+func (c *CmdCatchAll) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s domain
@@ -36,7 +37,7 @@ Required Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *CatchAllCommand) Run(args []string) int {
+func (c *CmdCatchAll) Run(args []string) int {
 	if len(args) != 1 {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
 		return 1
@@ -46,13 +47,13 @@ func (c *CatchAllCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	catchAllUser, err := repo.CatchAllUser(domainName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/catchallset.go b/cmd/mailfull/cmd_catchallset.go
similarity index 63%
rename from cmd/mailfull/command/catchallset.go
rename to cmd/mailfull/cmd_catchallset.go
index 24acd67..632e0f1 100644
--- a/cmd/mailfull/command/catchallset.go
+++ b/cmd/mailfull/cmd_catchallset.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// CatchAllSetCommand represents a CatchAllSetCommand.
-type CatchAllSetCommand struct {
-	Meta
+// CmdCatchAllSet represents a CmdCatchAllSet.
+type CmdCatchAllSet struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *CatchAllSetCommand) Synopsis() string {
+func (c *CmdCatchAllSet) Synopsis() string {
 	return "Set a catchall user."
 }
 
 // Help returns long-form help text.
-func (c *CatchAllSetCommand) Help() string {
+func (c *CmdCatchAllSet) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain user
@@ -42,7 +43,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *CatchAllSetCommand) Run(args []string) int {
+func (c *CmdCatchAllSet) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -59,34 +60,26 @@ func (c *CatchAllSetCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	catchAllUser, err := mailfull.NewCatchAllUser(userName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.CatchAllUserSet(domainName, catchAllUser); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/catchallunset.go b/cmd/mailfull/cmd_catchallunset.go
similarity index 60%
rename from cmd/mailfull/command/catchallunset.go
rename to cmd/mailfull/cmd_catchallunset.go
index a6f3fe9..81859f8 100644
--- a/cmd/mailfull/command/catchallunset.go
+++ b/cmd/mailfull/cmd_catchallunset.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// CatchAllUnsetCommand represents a CatchAllUnsetCommand.
-type CatchAllUnsetCommand struct {
-	Meta
+// CmdCatchAllUnset represents a CmdCatchAllUnset.
+type CmdCatchAllUnset struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *CatchAllUnsetCommand) Synopsis() string {
+func (c *CmdCatchAllUnset) Synopsis() string {
 	return "Unset a catchall user."
 }
 
 // Help returns long-form help text.
-func (c *CatchAllUnsetCommand) Help() string {
+func (c *CmdCatchAllUnset) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain
@@ -40,7 +41,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *CatchAllUnsetCommand) Run(args []string) int {
+func (c *CmdCatchAllUnset) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -56,28 +57,20 @@ func (c *CatchAllUnsetCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.CatchAllUserUnset(domainName); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/cmd_commit.go b/cmd/mailfull/cmd_commit.go
new file mode 100644
index 0000000..ade21f1
--- /dev/null
+++ b/cmd/mailfull/cmd_commit.go
@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
+)
+
+// CmdCommit represents a CmdCommit.
+type CmdCommit struct {
+	cmd.Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *CmdCommit) Synopsis() string {
+	return "Create databases from the structure of the MailData directory."
+}
+
+// Help returns long-form help text.
+func (c *CmdCommit) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s
+
+Description:
+    %s
+`,
+		c.CmdName, c.SubCmdName,
+		c.Synopsis())
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *CmdCommit) Run(args []string) int {
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		c.Meta.Errorf("%v\n", err)
+		return 1
+	}
+
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
+		return 1
+	}
+
+	return 0
+}
diff --git a/cmd/mailfull/command/domainadd.go b/cmd/mailfull/cmd_domainadd.go
similarity index 62%
rename from cmd/mailfull/command/domainadd.go
rename to cmd/mailfull/cmd_domainadd.go
index 1983d30..72a47b1 100644
--- a/cmd/mailfull/command/domainadd.go
+++ b/cmd/mailfull/cmd_domainadd.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// DomainAddCommand represents a DomainAddCommand.
-type DomainAddCommand struct {
-	Meta
+// CmdDomainAdd represents a CmdDomainAdd.
+type CmdDomainAdd struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *DomainAddCommand) Synopsis() string {
+func (c *CmdDomainAdd) Synopsis() string {
 	return "Create a new domain and postmaster."
 }
 
 // Help returns long-form help text.
-func (c *DomainAddCommand) Help() string {
+func (c *CmdDomainAdd) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain
@@ -40,7 +41,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *DomainAddCommand) Run(args []string) int {
+func (c *CmdDomainAdd) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -56,45 +57,37 @@ func (c *DomainAddCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	domain, err := mailfull.NewDomain(domainName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.DomainCreate(domain); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	user, err := mailfull.NewUser("postmaster", mailfull.NeverMatchHashedPassword, nil)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.UserCreate(domainName, user); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/domaindel.go b/cmd/mailfull/cmd_domaindel.go
similarity index 61%
rename from cmd/mailfull/command/domaindel.go
rename to cmd/mailfull/cmd_domaindel.go
index a8b9be9..5845ff9 100644
--- a/cmd/mailfull/command/domaindel.go
+++ b/cmd/mailfull/cmd_domaindel.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// DomainDelCommand represents a DomainDelCommand.
-type DomainDelCommand struct {
-	Meta
+// CmdDomainDel represents a CmdDomainDel.
+type CmdDomainDel struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *DomainDelCommand) Synopsis() string {
+func (c *CmdDomainDel) Synopsis() string {
 	return "Delete and backup a domain."
 }
 
 // Help returns long-form help text.
-func (c *DomainDelCommand) Help() string {
+func (c *CmdDomainDel) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain
@@ -40,7 +41,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *DomainDelCommand) Run(args []string) int {
+func (c *CmdDomainDel) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -56,28 +57,20 @@ func (c *DomainDelCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.DomainRemove(domainName); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/domaindisable.go b/cmd/mailfull/cmd_domaindisable.go
similarity index 59%
rename from cmd/mailfull/command/domaindisable.go
rename to cmd/mailfull/cmd_domaindisable.go
index c254c77..ff44139 100644
--- a/cmd/mailfull/command/domaindisable.go
+++ b/cmd/mailfull/cmd_domaindisable.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// DomainDisableCommand represents a DomainDisableCommand.
-type DomainDisableCommand struct {
-	Meta
+// CmdDomainDisable represents a CmdDomainDisable.
+type CmdDomainDisable struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *DomainDisableCommand) Synopsis() string {
+func (c *CmdDomainDisable) Synopsis() string {
 	return "Disable a domain temporarily."
 }
 
 // Help returns long-form help text.
-func (c *DomainDisableCommand) Help() string {
+func (c *CmdDomainDisable) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain
@@ -40,7 +41,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *DomainDisableCommand) Run(args []string) int {
+func (c *CmdDomainDisable) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -56,40 +57,32 @@ func (c *DomainDisableCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	domain, err := repo.Domain(domainName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 	if domain == nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", mailfull.ErrDomainNotExist)
+		c.Meta.Errorf("%v\n", mailfull.ErrDomainNotExist)
 		return 1
 	}
 
 	domain.SetDisabled(true)
 
 	if err := repo.DomainUpdate(domain); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/domainenable.go b/cmd/mailfull/cmd_domainenable.go
similarity index 59%
rename from cmd/mailfull/command/domainenable.go
rename to cmd/mailfull/cmd_domainenable.go
index 6fff76d..42f1542 100644
--- a/cmd/mailfull/command/domainenable.go
+++ b/cmd/mailfull/cmd_domainenable.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// DomainEnableCommand represents a DomainEnableCommand.
-type DomainEnableCommand struct {
-	Meta
+// CmdDomainEnable represents a CmdDomainEnable.
+type CmdDomainEnable struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *DomainEnableCommand) Synopsis() string {
+func (c *CmdDomainEnable) Synopsis() string {
 	return "Enable a domain."
 }
 
 // Help returns long-form help text.
-func (c *DomainEnableCommand) Help() string {
+func (c *CmdDomainEnable) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] domain
@@ -40,7 +41,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *DomainEnableCommand) Run(args []string) int {
+func (c *CmdDomainEnable) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -56,40 +57,32 @@ func (c *DomainEnableCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	domain, err := repo.Domain(domainName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 	if domain == nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", mailfull.ErrDomainNotExist)
+		c.Meta.Errorf("%v\n", mailfull.ErrDomainNotExist)
 		return 1
 	}
 
 	domain.SetDisabled(false)
 
 	if err := repo.DomainUpdate(domain); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/domains.go b/cmd/mailfull/cmd_domains.go
similarity index 64%
rename from cmd/mailfull/command/domains.go
rename to cmd/mailfull/cmd_domains.go
index 83b65d5..9c3ba38 100644
--- a/cmd/mailfull/command/domains.go
+++ b/cmd/mailfull/cmd_domains.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"sort"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// DomainsCommand represents a DomainsCommand.
-type DomainsCommand struct {
-	Meta
+// CmdDomains represents a CmdDomains.
+type CmdDomains struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *DomainsCommand) Synopsis() string {
+func (c *CmdDomains) Synopsis() string {
 	return "Show domains."
 }
 
 // Help returns long-form help text.
-func (c *DomainsCommand) Help() string {
+func (c *CmdDomains) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s
@@ -34,19 +35,19 @@ Description:
 }
 
 // Run runs the command and returns the exit status.
-func (c *DomainsCommand) Run(args []string) int {
+func (c *CmdDomains) Run(args []string) int {
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	domains, err := repo.Domains()
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
-	sort.Sort(mailfull.DomainSlice(domains))
+	sort.Slice(domains, func(i, j int) bool { return domains[i].Name() < domains[j].Name() })
 
 	for _, domain := range domains {
 		disableStr := ""
diff --git a/cmd/mailfull/command/genconfig.go b/cmd/mailfull/cmd_genconfig.go
similarity index 71%
rename from cmd/mailfull/command/genconfig.go
rename to cmd/mailfull/cmd_genconfig.go
index e2a4b27..5cf4dd8 100644
--- a/cmd/mailfull/command/genconfig.go
+++ b/cmd/mailfull/cmd_genconfig.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// GenConfigCommand represents a GenConfigCommand.
-type GenConfigCommand struct {
-	Meta
+// CmdGenConfig represents a CmdGenConfig.
+type CmdGenConfig struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *GenConfigCommand) Synopsis() string {
+func (c *CmdGenConfig) Synopsis() string {
 	return "Write a Postfix or Dovecot configuration to stdout."
 }
 
 // Help returns long-form help text.
-func (c *GenConfigCommand) Help() string {
+func (c *CmdGenConfig) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s name
@@ -37,7 +38,7 @@ Required Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *GenConfigCommand) Run(args []string) int {
+func (c *CmdGenConfig) Run(args []string) int {
 	if len(args) != 1 {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
 		return 1
@@ -47,7 +48,7 @@ func (c *GenConfigCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
@@ -59,7 +60,7 @@ func (c *GenConfigCommand) Run(args []string) int {
 		fmt.Fprintf(c.UI.Writer, "%s", repo.GenerateConfigDovecot())
 
 	default:
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] Specify \"postfix\" or \"dovecot\".\n")
+		c.Meta.Errorf("Specify \"postfix\" or \"dovecot\".\n")
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/init.go b/cmd/mailfull/cmd_init.go
similarity index 63%
rename from cmd/mailfull/command/init.go
rename to cmd/mailfull/cmd_init.go
index b915c7c..922e30d 100644
--- a/cmd/mailfull/command/init.go
+++ b/cmd/mailfull/cmd_init.go
@@ -1,23 +1,24 @@
-package command
+package main
 
 import (
 	"fmt"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// InitCommand represents a InitCommand.
-type InitCommand struct {
-	Meta
+// CmdInit represents a CmdInit.
+type CmdInit struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *InitCommand) Synopsis() string {
+func (c *CmdInit) Synopsis() string {
 	return "Initializes current directory as a Mailfull repository."
 }
 
 // Help returns long-form help text.
-func (c *InitCommand) Help() string {
+func (c *CmdInit) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s
@@ -32,9 +33,9 @@ Description:
 }
 
 // Run runs the command and returns the exit status.
-func (c *InitCommand) Run(args []string) int {
+func (c *CmdInit) Run(args []string) int {
 	if err := mailfull.InitRepository("."); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/useradd.go b/cmd/mailfull/cmd_useradd.go
similarity index 66%
rename from cmd/mailfull/command/useradd.go
rename to cmd/mailfull/cmd_useradd.go
index 943f493..5259db4 100644
--- a/cmd/mailfull/command/useradd.go
+++ b/cmd/mailfull/cmd_useradd.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"strings"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// UserAddCommand represents a UserAddCommand.
-type UserAddCommand struct {
-	Meta
+// CmdUserAdd represents a CmdUserAdd.
+type CmdUserAdd struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *UserAddCommand) Synopsis() string {
+func (c *CmdUserAdd) Synopsis() string {
 	return "Create a new user."
 }
 
 // Help returns long-form help text.
-func (c *UserAddCommand) Help() string {
+func (c *CmdUserAdd) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] address
@@ -41,7 +42,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *UserAddCommand) Run(args []string) int {
+func (c *CmdUserAdd) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -65,34 +66,26 @@ func (c *UserAddCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	user, err := mailfull.NewUser(userName, mailfull.NeverMatchHashedPassword, nil)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if err := repo.UserCreate(domainName, user); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/usercheckpw.go b/cmd/mailfull/cmd_usercheckpw.go
similarity index 77%
rename from cmd/mailfull/command/usercheckpw.go
rename to cmd/mailfull/cmd_usercheckpw.go
index 4ef780a..65542aa 100644
--- a/cmd/mailfull/command/usercheckpw.go
+++ b/cmd/mailfull/cmd_usercheckpw.go
@@ -1,25 +1,26 @@
-package command
+package main
 
 import (
 	"fmt"
 	"strings"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 	"github.com/jsimonetti/pwscheme/ssha"
 )
 
-// UserCheckPwCommand represents a UserCheckPwCommand.
-type UserCheckPwCommand struct {
-	Meta
+// CmdUserCheckPw represents a CmdUserCheckPw.
+type CmdUserCheckPw struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *UserCheckPwCommand) Synopsis() string {
+func (c *CmdUserCheckPw) Synopsis() string {
 	return "Check user's password."
 }
 
 // Help returns long-form help text.
-func (c *UserCheckPwCommand) Help() string {
+func (c *CmdUserCheckPw) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s address [password]
@@ -43,7 +44,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *UserCheckPwCommand) Run(args []string) int {
+func (c *CmdUserCheckPw) Run(args []string) int {
 	if len(args) != 1 && len(args) != 2 {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
 		return 1
@@ -66,24 +67,24 @@ func (c *UserCheckPwCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	user, err := repo.User(domainName, userName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 	if user == nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", mailfull.ErrUserNotExist)
+		c.Meta.Errorf("%v\n", mailfull.ErrUserNotExist)
 		return 1
 	}
 
 	if len(args) != 2 {
 		input, err := c.UI.AskSecret(fmt.Sprintf("Enter password for %s:", address))
 		if err != nil {
-			fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+			c.Meta.Errorf("%v\n", err)
 			return 1
 		}
 
diff --git a/cmd/mailfull/command/userdel.go b/cmd/mailfull/cmd_userdel.go
similarity index 64%
rename from cmd/mailfull/command/userdel.go
rename to cmd/mailfull/cmd_userdel.go
index 858b8ff..448f7fd 100644
--- a/cmd/mailfull/command/userdel.go
+++ b/cmd/mailfull/cmd_userdel.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"strings"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// UserDelCommand represents a UserDelCommand.
-type UserDelCommand struct {
-	Meta
+// CmdUserDel represents a CmdUserDel.
+type CmdUserDel struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *UserDelCommand) Synopsis() string {
+func (c *CmdUserDel) Synopsis() string {
 	return "Delete and backup a user."
 }
 
 // Help returns long-form help text.
-func (c *UserDelCommand) Help() string {
+func (c *CmdUserDel) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] address
@@ -41,7 +42,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *UserDelCommand) Run(args []string) int {
+func (c *CmdUserDel) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -65,33 +66,25 @@ func (c *UserDelCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if userName == "postmaster" {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] Cannot delete postmaster.\n")
+		c.Meta.Errorf("Cannot delete postmaster.\n")
 		return 1
 	}
 
 	if err := repo.UserRemove(domainName, userName); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/userpasswd.go b/cmd/mailfull/cmd_userpasswd.go
similarity index 69%
rename from cmd/mailfull/command/userpasswd.go
rename to cmd/mailfull/cmd_userpasswd.go
index bbd724c..07ea488 100644
--- a/cmd/mailfull/command/userpasswd.go
+++ b/cmd/mailfull/cmd_userpasswd.go
@@ -1,25 +1,26 @@
-package command
+package main
 
 import (
 	"fmt"
 	"strings"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 	"github.com/jsimonetti/pwscheme/ssha"
 )
 
-// UserPasswdCommand represents a UserPasswdCommand.
-type UserPasswdCommand struct {
-	Meta
+// CmdUserPasswd represents a CmdUserPasswd.
+type CmdUserPasswd struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *UserPasswdCommand) Synopsis() string {
+func (c *CmdUserPasswd) Synopsis() string {
 	return "Update user's password."
 }
 
 // Help returns long-form help text.
-func (c *UserPasswdCommand) Help() string {
+func (c *CmdUserPasswd) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s [-n] address [password]
@@ -45,7 +46,7 @@ Optional Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *UserPasswdCommand) Run(args []string) int {
+func (c *CmdUserPasswd) Run(args []string) int {
 	noCommit, err := noCommitFlag(&args)
 	if err != nil {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
@@ -74,33 +75,33 @@ func (c *UserPasswdCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	user, err := repo.User(domainName, userName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 	if user == nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", mailfull.ErrUserNotExist)
+		c.Meta.Errorf("%v\n", mailfull.ErrUserNotExist)
 		return 1
 	}
 
 	if len(args) != 2 {
 		input1, err := c.UI.AskSecret(fmt.Sprintf("Enter new password for %s:", address))
 		if err != nil {
-			fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+			c.Meta.Errorf("%v\n", err)
 			return 1
 		}
 		input2, err := c.UI.AskSecret("Retype new password:")
 		if err != nil {
-			fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+			c.Meta.Errorf("%v\n", err)
 			return 1
 		}
 		if input1 != input2 {
-			fmt.Fprintf(c.UI.ErrorWriter, "[ERR] inputs do not match.\n")
+			c.Meta.Errorf("inputs do not match.\n")
 			return 1
 		}
 		rawPassword = input1
@@ -110,7 +111,7 @@ func (c *UserPasswdCommand) Run(args []string) int {
 	if rawPassword != "" {
 		str, err := ssha.Generate(rawPassword, 4)
 		if err != nil {
-			fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+			c.Meta.Errorf("%v\n", err)
 			return 1
 		}
 		hashedPassword = str
@@ -119,23 +120,15 @@ func (c *UserPasswdCommand) Run(args []string) int {
 	user.SetHashedPassword(hashedPassword)
 
 	if err := repo.UserUpdate(domainName, user); err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	if noCommit {
 		return 0
 	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+	if err = repo.GenerateDatabases(); err != nil {
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
diff --git a/cmd/mailfull/command/users.go b/cmd/mailfull/cmd_users.go
similarity index 66%
rename from cmd/mailfull/command/users.go
rename to cmd/mailfull/cmd_users.go
index 2f5038d..66d5741 100644
--- a/cmd/mailfull/command/users.go
+++ b/cmd/mailfull/cmd_users.go
@@ -1,24 +1,25 @@
-package command
+package main
 
 import (
 	"fmt"
 	"sort"
 
 	"github.com/directorz/mailfull-go"
+	"github.com/directorz/mailfull-go/cmd"
 )
 
-// UsersCommand represents a UsersCommand.
-type UsersCommand struct {
-	Meta
+// CmdUsers represents a CmdUsers.
+type CmdUsers struct {
+	cmd.Meta
 }
 
 // Synopsis returns a one-line synopsis.
-func (c *UsersCommand) Synopsis() string {
+func (c *CmdUsers) Synopsis() string {
 	return "Show users."
 }
 
 // Help returns long-form help text.
-func (c *UsersCommand) Help() string {
+func (c *CmdUsers) Help() string {
 	txt := fmt.Sprintf(`
 Usage:
     %s %s domain
@@ -37,7 +38,7 @@ Required Args:
 }
 
 // Run runs the command and returns the exit status.
-func (c *UsersCommand) Run(args []string) int {
+func (c *CmdUsers) Run(args []string) int {
 	if len(args) != 1 {
 		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
 		return 1
@@ -47,16 +48,16 @@ func (c *UsersCommand) Run(args []string) int {
 
 	repo, err := mailfull.OpenRepository(".")
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
 
 	users, err := repo.Users(targetDomainName)
 	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		c.Meta.Errorf("%v\n", err)
 		return 1
 	}
-	sort.Sort(mailfull.UserSlice(users))
+	sort.Slice(users, func(i, j int) bool { return users[i].Name() < users[j].Name() })
 
 	for _, user := range users {
 		fmt.Fprintf(c.UI.Writer, "%s\n", user.Name())
diff --git a/cmd/mailfull/command/commit.go b/cmd/mailfull/command/commit.go
deleted file mode 100644
index 790b071..0000000
--- a/cmd/mailfull/command/commit.go
+++ /dev/null
@@ -1,55 +0,0 @@
-package command
-
-import (
-	"fmt"
-
-	"github.com/directorz/mailfull-go"
-)
-
-// CommitCommand represents a CommitCommand.
-type CommitCommand struct {
-	Meta
-}
-
-// Synopsis returns a one-line synopsis.
-func (c *CommitCommand) Synopsis() string {
-	return "Create databases from the structure of the MailData directory."
-}
-
-// Help returns long-form help text.
-func (c *CommitCommand) Help() string {
-	txt := fmt.Sprintf(`
-Usage:
-    %s %s
-
-Description:
-    %s
-`,
-		c.CmdName, c.SubCmdName,
-		c.Synopsis())
-
-	return txt[1:]
-}
-
-// Run runs the command and returns the exit status.
-func (c *CommitCommand) Run(args []string) int {
-	repo, err := mailfull.OpenRepository(".")
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	mailData, err := repo.MailData()
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	err = repo.GenerateDatabases(mailData)
-	if err != nil {
-		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
-		return 1
-	}
-
-	return 0
-}
diff --git a/cmd/mailfull/command/main.go b/cmd/mailfull/command/main.go
deleted file mode 100644
index 66be466..0000000
--- a/cmd/mailfull/command/main.go
+++ /dev/null
@@ -1,30 +0,0 @@
-package command
-
-import (
-	"bytes"
-	"flag"
-
-	"github.com/mitchellh/cli"
-)
-
-// Meta is for `*Command` struct.
-type Meta struct {
-	UI         *cli.BasicUi
-	CmdName    string
-	SubCmdName string
-	Version    string
-}
-
-// noCommitFlag returns true if `pargs` has "-n" flag.
-// `pargs` is overwrites with non-flag arguments.
-func noCommitFlag(pargs *[]string) (bool, error) {
-	nFlag := false
-
-	flagSet := flag.NewFlagSet("", flag.ContinueOnError)
-	flagSet.SetOutput(&bytes.Buffer{})
-	flagSet.BoolVar(&nFlag, "n", nFlag, "")
-	err := flagSet.Parse(*pargs)
-	*pargs = flagSet.Args()
-
-	return nFlag, err
-}
diff --git a/cmd/mailfull/mailfull.go b/cmd/mailfull/main.go
similarity index 65%
rename from cmd/mailfull/mailfull.go
rename to cmd/mailfull/main.go
index 905a77a..ca74d78 100644
--- a/cmd/mailfull/mailfull.go
+++ b/cmd/mailfull/main.go
@@ -4,12 +4,14 @@ Command mailfull is a CLI application using the mailfull package.
 package main
 
 import (
+	"bytes"
+	"flag"
 	"fmt"
 	"os"
 	"path/filepath"
 
 	"github.com/directorz/mailfull-go"
-	"github.com/directorz/mailfull-go/cmd/mailfull/command"
+	"github.com/directorz/mailfull-go/cmd"
 	"github.com/mitchellh/cli"
 )
 
@@ -31,7 +33,7 @@ func main() {
 		Args:    os.Args[1:],
 	}
 
-	meta := command.Meta{
+	meta := cmd.Meta{
 		UI: &cli.BasicUi{
 			Reader:      os.Stdin,
 			Writer:      os.Stdout,
@@ -44,95 +46,95 @@ func main() {
 	c.Commands = map[string]cli.CommandFactory{
 		"init": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.InitCommand{Meta: meta}, nil
+			return &CmdInit{Meta: meta}, nil
 		},
 		"genconfig": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.GenConfigCommand{Meta: meta}, nil
+			return &CmdGenConfig{Meta: meta}, nil
 		},
 		"domains": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.DomainsCommand{Meta: meta}, nil
+			return &CmdDomains{Meta: meta}, nil
 		},
 		"domainadd": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.DomainAddCommand{Meta: meta}, nil
+			return &CmdDomainAdd{Meta: meta}, nil
 		},
 		"domaindel": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.DomainDelCommand{Meta: meta}, nil
+			return &CmdDomainDel{Meta: meta}, nil
 		},
 		"domaindisable": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.DomainDisableCommand{Meta: meta}, nil
+			return &CmdDomainDisable{Meta: meta}, nil
 		},
 		"domainenable": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.DomainEnableCommand{Meta: meta}, nil
+			return &CmdDomainEnable{Meta: meta}, nil
 		},
 		"aliasdomains": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.AliasDomainsCommand{Meta: meta}, nil
+			return &CmdAliasDomains{Meta: meta}, nil
 		},
 		"aliasdomainadd": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.AliasDomainAddCommand{Meta: meta}, nil
+			return &CmdAliasDomainAdd{Meta: meta}, nil
 		},
 		"aliasdomaindel": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.AliasDomainDelCommand{Meta: meta}, nil
+			return &CmdAliasDomainDel{Meta: meta}, nil
 		},
 		"users": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.UsersCommand{Meta: meta}, nil
+			return &CmdUsers{Meta: meta}, nil
 		},
 		"useradd": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.UserAddCommand{Meta: meta}, nil
+			return &CmdUserAdd{Meta: meta}, nil
 		},
 		"userdel": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.UserDelCommand{Meta: meta}, nil
+			return &CmdUserDel{Meta: meta}, nil
 		},
 		"userpasswd": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.UserPasswdCommand{Meta: meta}, nil
+			return &CmdUserPasswd{Meta: meta}, nil
 		},
 		"usercheckpw": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.UserCheckPwCommand{Meta: meta}, nil
+			return &CmdUserCheckPw{Meta: meta}, nil
 		},
 		"aliasusers": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.AliasUsersCommand{Meta: meta}, nil
+			return &CmdAliasUsers{Meta: meta}, nil
 		},
 		"aliasuseradd": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.AliasUserAddCommand{Meta: meta}, nil
+			return &CmdAliasUserAdd{Meta: meta}, nil
 		},
 		"aliasusermod": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.AliasUserModCommand{Meta: meta}, nil
+			return &CmdAliasUserMod{Meta: meta}, nil
 		},
 		"aliasuserdel": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.AliasUserDelCommand{Meta: meta}, nil
+			return &CmdAliasUserDel{Meta: meta}, nil
 		},
 		"catchall": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.CatchAllCommand{Meta: meta}, nil
+			return &CmdCatchAll{Meta: meta}, nil
 		},
 		"catchallset": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.CatchAllSetCommand{Meta: meta}, nil
+			return &CmdCatchAllSet{Meta: meta}, nil
 		},
 		"catchallunset": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.CatchAllUnsetCommand{Meta: meta}, nil
+			return &CmdCatchAllUnset{Meta: meta}, nil
 		},
 		"commit": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
-			return &command.CommitCommand{Meta: meta}, nil
+			return &CmdCommit{Meta: meta}, nil
 		},
 	}
 
@@ -143,3 +145,17 @@ func main() {
 
 	os.Exit(exitCode)
 }
+
+// noCommitFlag returns true if `pargs` has "-n" flag.
+// `pargs` is overwrites with non-flag arguments.
+func noCommitFlag(pargs *[]string) (bool, error) {
+	nFlag := false
+
+	flagSet := flag.NewFlagSet("", flag.ContinueOnError)
+	flagSet.SetOutput(&bytes.Buffer{})
+	flagSet.BoolVar(&nFlag, "n", nFlag, "")
+	err := flagSet.Parse(*pargs)
+	*pargs = flagSet.Args()
+
+	return nFlag, err
+}
diff --git a/cmd/meta.go b/cmd/meta.go
new file mode 100644
index 0000000..02e5334
--- /dev/null
+++ b/cmd/meta.go
@@ -0,0 +1,20 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/mitchellh/cli"
+)
+
+// Meta contains options to execute a command.
+type Meta struct {
+	UI         *cli.BasicUi
+	CmdName    string
+	SubCmdName string
+	Version    string
+}
+
+// Errorf prints the error to ErrorWriter with the prefix string.
+func (m Meta) Errorf(format string, v ...interface{}) {
+	fmt.Fprintf(m.UI.ErrorWriter, "[ERR] "+format, v...)
+}
diff --git a/database.go b/database.go
index e12cf5c..3dd0d30 100644
--- a/database.go
+++ b/database.go
@@ -9,33 +9,84 @@ import (
 	"strings"
 )
 
-// GenerateDatabases generates databases from the MailData directory.
-func (r *Repository) GenerateDatabases(md *MailData) error {
-	sort.Sort(DomainSlice(md.Domains))
-	sort.Sort(AliasDomainSlice(md.AliasDomains))
+// repoData represents a repoData.
+type repoData struct {
+	Domains      []*Domain
+	AliasDomains []*AliasDomain
+}
 
-	for _, domain := range md.Domains {
-		sort.Sort(UserSlice(domain.Users))
-		sort.Sort(AliasUserSlice(domain.AliasUsers))
+// repoData returns a repoData.
+func (r *Repository) repoData() (*repoData, error) {
+	domains, err := r.Domains()
+	if err != nil {
+		return nil, err
+	}
+
+	aliasDomains, err := r.AliasDomains()
+	if err != nil {
+		return nil, err
+	}
+
+	for _, domain := range domains {
+		users, err := r.Users(domain.Name())
+		if err != nil {
+			return nil, err
+		}
+		domain.Users = users
+
+		aliasUsers, err := r.AliasUsers(domain.Name())
+		if err != nil {
+			return nil, err
+		}
+		domain.AliasUsers = aliasUsers
+
+		catchAllUser, err := r.CatchAllUser(domain.Name())
+		if err != nil {
+			return nil, err
+		}
+		domain.CatchAllUser = catchAllUser
+	}
+
+	rd := &repoData{
+		Domains:      domains,
+		AliasDomains: aliasDomains,
+	}
+
+	return rd, nil
+}
+
+// GenerateDatabases generates databases from the Repository.
+func (r *Repository) GenerateDatabases() error {
+	rd, err := r.repoData()
+	if err != nil {
+		return err
+	}
+
+	sort.Slice(rd.Domains, func(i, j int) bool { return rd.Domains[i].Name() < rd.Domains[j].Name() })
+	sort.Slice(rd.AliasDomains, func(i, j int) bool { return rd.AliasDomains[i].Name() < rd.AliasDomains[j].Name() })
+
+	for _, domain := range rd.Domains {
+		sort.Slice(domain.Users, func(i, j int) bool { return domain.Users[i].Name() < domain.Users[j].Name() })
+		sort.Slice(domain.AliasUsers, func(i, j int) bool { return domain.AliasUsers[i].Name() < domain.AliasUsers[j].Name() })
 	}
 
 	// Generate files
-	if err := r.generateDbDomains(md); err != nil {
+	if err := r.generateDbDomains(rd); err != nil {
 		return err
 	}
-	if err := r.generateDbDestinations(md); err != nil {
+	if err := r.generateDbDestinations(rd); err != nil {
 		return err
 	}
-	if err := r.generateDbMaildirs(md); err != nil {
+	if err := r.generateDbMaildirs(rd); err != nil {
 		return err
 	}
-	if err := r.generateDbLocaltable(md); err != nil {
+	if err := r.generateDbLocaltable(rd); err != nil {
 		return err
 	}
-	if err := r.generateDbForwards(md); err != nil {
+	if err := r.generateDbForwards(rd); err != nil {
 		return err
 	}
-	if err := r.generateDbPasswords(md); err != nil {
+	if err := r.generateDbPasswords(rd); err != nil {
 		return err
 	}
 
@@ -59,7 +110,7 @@ func (r *Repository) GenerateDatabases(md *MailData) error {
 	return nil
 }
 
-func (r *Repository) generateDbDomains(md *MailData) error {
+func (r *Repository) generateDbDomains(rd *repoData) error {
 	dbDomains, err := os.Create(filepath.Join(r.DirDatabasePath, FileNameDbDomains))
 	if err != nil {
 		return err
@@ -69,7 +120,7 @@ func (r *Repository) generateDbDomains(md *MailData) error {
 	}
 	defer dbDomains.Close()
 
-	for _, domain := range md.Domains {
+	for _, domain := range rd.Domains {
 		if domain.Disabled() {
 			continue
 		}
@@ -79,7 +130,7 @@ func (r *Repository) generateDbDomains(md *MailData) error {
 		}
 	}
 
-	for _, aliasDomain := range md.AliasDomains {
+	for _, aliasDomain := range rd.AliasDomains {
 		if _, err := fmt.Fprintf(dbDomains, "%s virtual\n", aliasDomain.Name()); err != nil {
 			return err
 		}
@@ -88,7 +139,7 @@ func (r *Repository) generateDbDomains(md *MailData) error {
 	return nil
 }
 
-func (r *Repository) generateDbDestinations(md *MailData) error {
+func (r *Repository) generateDbDestinations(rd *repoData) error {
 	dbDestinations, err := os.Create(filepath.Join(r.DirDatabasePath, FileNameDbDestinations))
 	if err != nil {
 		return err
@@ -98,7 +149,7 @@ func (r *Repository) generateDbDestinations(md *MailData) error {
 	}
 	defer dbDestinations.Close()
 
-	for _, domain := range md.Domains {
+	for _, domain := range rd.Domains {
 		if domain.Disabled() {
 			continue
 		}
@@ -123,7 +174,7 @@ func (r *Repository) generateDbDestinations(md *MailData) error {
 				}
 			}
 
-			for _, aliasDomain := range md.AliasDomains {
+			for _, aliasDomain := range rd.AliasDomains {
 				if aliasDomain.Target() == domain.Name() {
 					if _, err := fmt.Fprintf(dbDestinations, "%s@%s %s@%s\n", userName, aliasDomain.Name(), user.Name(), domain.Name()); err != nil {
 						return err
@@ -137,7 +188,7 @@ func (r *Repository) generateDbDestinations(md *MailData) error {
 				return err
 			}
 
-			for _, aliasDomain := range md.AliasDomains {
+			for _, aliasDomain := range rd.AliasDomains {
 				if aliasDomain.Target() == domain.Name() {
 					if _, err := fmt.Fprintf(dbDestinations, "%s@%s %s@%s\n", aliasUser.Name(), aliasDomain.Name(), aliasUser.Name(), domain.Name()); err != nil {
 						return err
@@ -150,7 +201,7 @@ func (r *Repository) generateDbDestinations(md *MailData) error {
 	return nil
 }
 
-func (r *Repository) generateDbMaildirs(md *MailData) error {
+func (r *Repository) generateDbMaildirs(rd *repoData) error {
 	dbMaildirs, err := os.Create(filepath.Join(r.DirDatabasePath, FileNameDbMaildirs))
 	if err != nil {
 		return err
@@ -160,7 +211,7 @@ func (r *Repository) generateDbMaildirs(md *MailData) error {
 	}
 	defer dbMaildirs.Close()
 
-	for _, domain := range md.Domains {
+	for _, domain := range rd.Domains {
 		if domain.Disabled() {
 			continue
 		}
@@ -175,7 +226,7 @@ func (r *Repository) generateDbMaildirs(md *MailData) error {
 	return nil
 }
 
-func (r *Repository) generateDbLocaltable(md *MailData) error {
+func (r *Repository) generateDbLocaltable(rd *repoData) error {
 	dbLocaltable, err := os.Create(filepath.Join(r.DirDatabasePath, FileNameDbLocaltable))
 	if err != nil {
 		return err
@@ -185,7 +236,7 @@ func (r *Repository) generateDbLocaltable(md *MailData) error {
 	}
 	defer dbLocaltable.Close()
 
-	for _, domain := range md.Domains {
+	for _, domain := range rd.Domains {
 		if domain.Disabled() {
 			continue
 		}
@@ -203,7 +254,7 @@ func (r *Repository) generateDbLocaltable(md *MailData) error {
 	return nil
 }
 
-func (r *Repository) generateDbForwards(md *MailData) error {
+func (r *Repository) generateDbForwards(rd *repoData) error {
 	dbForwards, err := os.Create(filepath.Join(r.DirDatabasePath, FileNameDbForwards))
 	if err != nil {
 		return err
@@ -213,7 +264,7 @@ func (r *Repository) generateDbForwards(md *MailData) error {
 	}
 	defer dbForwards.Close()
 
-	for _, domain := range md.Domains {
+	for _, domain := range rd.Domains {
 		if domain.Disabled() {
 			continue
 		}
@@ -243,7 +294,7 @@ func (r *Repository) generateDbForwards(md *MailData) error {
 	return nil
 }
 
-func (r *Repository) generateDbPasswords(md *MailData) error {
+func (r *Repository) generateDbPasswords(rd *repoData) error {
 	dbPasswords, err := os.Create(filepath.Join(r.DirDatabasePath, FileNameDbPasswords))
 	if err != nil {
 		return err
@@ -253,7 +304,7 @@ func (r *Repository) generateDbPasswords(md *MailData) error {
 	}
 	defer dbPasswords.Close()
 
-	for _, domain := range md.Domains {
+	for _, domain := range rd.Domains {
 		if domain.Disabled() {
 			continue
 		}
diff --git a/doc/configuration.md b/doc/configuration.md
index aa73a0d..649b1d7 100644
--- a/doc/configuration.md
+++ b/doc/configuration.md
@@ -3,10 +3,10 @@ Configuration
 
 `.mailfull/config`
 
-| key | type | default | required | description |
-|:----|:-----|:--------|:---------|:------------|
-| dir_database | string | `"./etc"` | no | A relative path from repository dir (or a absolute path) |
-| dir_maildata | string | `"./domains"` | no | A relative path from repository dir (or a absolute path) |
-| username | string | The username who executed `mailfull init` | **yes** | It used for setting owner of database files and maildata files. |
-| cmd_postalias | string | `"postalias"` | no | Command name or path |
-| cmd_postmap | string | `"postmap"` | no | Command name or path |
+| key           | type   | default                                   | required | description                                                     |
+|:--------------|:-------|:------------------------------------------|:---------|:----------------------------------------------------------------|
+| dir_database  | string | `"./etc"`                                 | no       | A relative path from repository dir (or a absolute path)        |
+| dir_maildata  | string | `"./domains"`                             | no       | A relative path from repository dir (or a absolute path)        |
+| username      | string | The username who executed `mailfull init` | **yes**  | It used for setting owner of database files and maildata files. |
+| cmd_postalias | string | `"postalias"`                             | no       | Command name or path                                            |
+| cmd_postmap   | string | `"postmap"`                               | no       | Command name or path                                            |
diff --git a/domain.go b/domain.go
index c0089d7..f5e5044 100644
--- a/domain.go
+++ b/domain.go
@@ -17,13 +17,6 @@ type Domain struct {
 	CatchAllUser *CatchAllUser
 }
 
-// DomainSlice attaches the methods of sort.Interface to []*Domain.
-type DomainSlice []*Domain
-
-func (p DomainSlice) Len() int           { return len(p) }
-func (p DomainSlice) Less(i, j int) bool { return p[i].Name() < p[j].Name() }
-func (p DomainSlice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
-
 // NewDomain creates a new Domain instance.
 func NewDomain(name string) (*Domain, error) {
 	d := &Domain{}
diff --git a/glide.lock b/glide.lock
deleted file mode 100644
index 76c8ba5..0000000
--- a/glide.lock
+++ /dev/null
@@ -1,22 +0,0 @@
-hash: 451657f03f297af9163863497cf6c2f60abfe12d88a282f5aab6deb865d91119
-updated: 2016-09-29T12:05:32.00075722+09:00
-imports:
-- name: github.com/armon/go-radix
-  version: 4239b77079c7b5d1243b7b4736304ce8ddb6f0f2
-- name: github.com/bgentry/speakeasy
-  version: a1ccbf2c40dfc8ce514b5c5c6e6d1429ea6880da
-- name: github.com/BurntSushi/toml
-  version: 99064174e013895bbd9b025c31100bd1d9b590ca
-- name: github.com/jsimonetti/pwscheme
-  version: 76804708ecad54773871b35dbaa44f517973e395
-  subpackages:
-  - ssha
-- name: github.com/mattn/go-isatty
-  version: 66b8e73f3f5cda9f96b69efd03dd3d7fc4a5cdb8
-- name: github.com/mitchellh/cli
-  version: fcf521421aa29bde1d93b6920dfce826d7932208
-- name: golang.org/x/sys
-  version: 8f0908ab3b2457e2e15403d3697c9ef5cb4b57a9
-  subpackages:
-  - unix
-testImports: []
diff --git a/glide.yaml b/glide.yaml
deleted file mode 100644
index 00937dd..0000000
--- a/glide.yaml
+++ /dev/null
@@ -1,7 +0,0 @@
-package: github.com/directorz/mailfull-go
-import:
-- package: github.com/BurntSushi/toml
-- package: github.com/jsimonetti/pwscheme
-  subpackages:
-  - ssha
-- package: github.com/mitchellh/cli
diff --git a/maildata.go b/maildata.go
deleted file mode 100644
index 7e32b38..0000000
--- a/maildata.go
+++ /dev/null
@@ -1,47 +0,0 @@
-package mailfull
-
-// MailData represents a MailData.
-type MailData struct {
-	Domains      []*Domain
-	AliasDomains []*AliasDomain
-}
-
-// MailData returns a MailData.
-func (r *Repository) MailData() (*MailData, error) {
-	domains, err := r.Domains()
-	if err != nil {
-		return nil, err
-	}
-
-	aliasDomains, err := r.AliasDomains()
-	if err != nil {
-		return nil, err
-	}
-
-	for _, domain := range domains {
-		users, err := r.Users(domain.Name())
-		if err != nil {
-			return nil, err
-		}
-		domain.Users = users
-
-		aliasUsers, err := r.AliasUsers(domain.Name())
-		if err != nil {
-			return nil, err
-		}
-		domain.AliasUsers = aliasUsers
-
-		catchAllUser, err := r.CatchAllUser(domain.Name())
-		if err != nil {
-			return nil, err
-		}
-		domain.CatchAllUser = catchAllUser
-	}
-
-	mailData := &MailData{
-		Domains:      domains,
-		AliasDomains: aliasDomains,
-	}
-
-	return mailData, nil
-}
diff --git a/user.go b/user.go
index cdf3bec..c502cb8 100644
--- a/user.go
+++ b/user.go
@@ -19,13 +19,6 @@ type User struct {
 	forwards       []string
 }
 
-// UserSlice attaches the methods of sort.Interface to []*User.
-type UserSlice []*User
-
-func (p UserSlice) Len() int           { return len(p) }
-func (p UserSlice) Less(i, j int) bool { return p[i].Name() < p[j].Name() }
-func (p UserSlice) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
-
 // NewUser creates a new User instance.
 func NewUser(name, hashedPassword string, forwards []string) (*User, error) {
 	u := &User{}
diff --git a/version.go b/version.go
index e92ef57..383d0a1 100644
--- a/version.go
+++ b/version.go
@@ -1,4 +1,4 @@
 package mailfull
 
 // Version is a version number.
-const Version = "v0.0.7"
+const Version = "v1.0.0"