diff --git a/cmd/mailfull/command/aliasuseradd.go b/cmd/mailfull/command/aliasuseradd.go
new file mode 100644
index 0000000..815a01a
--- /dev/null
+++ b/cmd/mailfull/command/aliasuseradd.go
@@ -0,0 +1,89 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	mailfull "github.com/directorz/mailfull-go"
+)
+
+// AliasUserAddCommand represents a AliasUserAddCommand.
+type AliasUserAddCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *AliasUserAddCommand) Synopsis() string {
+	return "Create a new aliasuser."
+}
+
+// Help returns long-form help text.
+func (c *AliasUserAddCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s address target [target...]
+
+Description:
+    %s
+
+Required Args:
+    address
+        The email address that you want to create.
+    target
+        Target email addresses.
+`,
+		c.CmdName, c.SubCmdName,
+		c.Synopsis())
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *AliasUserAddCommand) Run(args []string) int {
+	if len(args) < 2 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+
+	address := args[0]
+	targets := args[1:]
+
+	words := strings.Split(address, "@")
+	if len(words) != 2 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+	aliasUserName := words[0]
+	domainName := words[1]
+
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	aliasUser, err := mailfull.NewAliasUser(aliasUserName, targets)
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	if err := repo.AliasUserCreate(domainName, aliasUser); 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/aliasuserdel.go b/cmd/mailfull/command/aliasuserdel.go
new file mode 100644
index 0000000..ea519c2
--- /dev/null
+++ b/cmd/mailfull/command/aliasuserdel.go
@@ -0,0 +1,79 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	mailfull "github.com/directorz/mailfull-go"
+)
+
+// AliasUserDelCommand represents a AliasUserDelCommand.
+type AliasUserDelCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *AliasUserDelCommand) Synopsis() string {
+	return "Delete a aliasuser."
+}
+
+// Help returns long-form help text.
+func (c *AliasUserDelCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s address
+
+Description:
+    %s
+
+Required Args:
+    address
+        The email address that you want to delete.
+`,
+		c.CmdName, c.SubCmdName,
+		c.Synopsis())
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *AliasUserDelCommand) Run(args []string) int {
+	if len(args) != 1 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+
+	address := args[0]
+	words := strings.Split(address, "@")
+	if len(words) != 2 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+	aliasUserName := words[0]
+	domainName := words[1]
+
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	if err := repo.AliasUserRemove(domainName, aliasUserName); 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/aliasusermod.go b/cmd/mailfull/command/aliasusermod.go
new file mode 100644
index 0000000..16763fe
--- /dev/null
+++ b/cmd/mailfull/command/aliasusermod.go
@@ -0,0 +1,98 @@
+package command
+
+import (
+	"fmt"
+	"strings"
+
+	mailfull "github.com/directorz/mailfull-go"
+)
+
+// AliasUserModCommand represents a AliasUserModCommand.
+type AliasUserModCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *AliasUserModCommand) Synopsis() string {
+	return "Modify a aliasuser."
+}
+
+// Help returns long-form help text.
+func (c *AliasUserModCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s address target [target...]
+
+Description:
+    %s
+
+Required Args:
+    address
+        The email address that you want to modify.
+    target
+        Target email addresses.
+`,
+		c.CmdName, c.SubCmdName,
+		c.Synopsis())
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *AliasUserModCommand) Run(args []string) int {
+	if len(args) < 2 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+
+	address := args[0]
+	targets := args[1:]
+
+	words := strings.Split(address, "@")
+	if len(words) != 2 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+	aliasUserName := words[0]
+	domainName := words[1]
+
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	aliasUser, err := repo.AliasUser(domainName, aliasUserName)
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+	if aliasUser == nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", mailfull.ErrAliasUserNotExist)
+		return 1
+	}
+
+	if err := aliasUser.SetTargets(targets); err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	if err := repo.AliasUserUpdate(domainName, aliasUser); 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/aliasusers.go b/cmd/mailfull/command/aliasusers.go
new file mode 100644
index 0000000..036b23a
--- /dev/null
+++ b/cmd/mailfull/command/aliasusers.go
@@ -0,0 +1,66 @@
+package command
+
+import (
+	"fmt"
+	"sort"
+
+	"github.com/directorz/mailfull-go"
+)
+
+// AliasUsersCommand represents a AliasUsersCommand.
+type AliasUsersCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *AliasUsersCommand) Synopsis() string {
+	return "Show aliasusers."
+}
+
+// Help returns long-form help text.
+func (c *AliasUsersCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s domain
+
+Description:
+    %s
+
+Required Args:
+    domain
+        The domain name.
+`,
+		c.CmdName, c.SubCmdName,
+		c.Synopsis())
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *AliasUsersCommand) Run(args []string) int {
+	if len(args) != 1 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+
+	targetDomainName := args[0]
+
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	aliasUsers, err := repo.AliasUsers(targetDomainName)
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+	sort.Sort(mailfull.AliasUserSlice(aliasUsers))
+
+	for _, aliasUser := range aliasUsers {
+		fmt.Fprintf(c.UI.Writer, "%s\n", aliasUser.Name())
+	}
+
+	return 0
+}
diff --git a/cmd/mailfull/main.go b/cmd/mailfull/main.go
index b05b11d..a0fd7a2 100644
--- a/cmd/mailfull/main.go
+++ b/cmd/mailfull/main.go
@@ -87,6 +87,22 @@ func main() {
 			meta.SubCmdName = c.Subcommand()
 			return &command.UserCheckPwCommand{Meta: meta}, nil
 		},
+		"aliasusers": func() (cli.Command, error) {
+			meta.SubCmdName = c.Subcommand()
+			return &command.AliasUsersCommand{Meta: meta}, nil
+		},
+		"aliasuseradd": func() (cli.Command, error) {
+			meta.SubCmdName = c.Subcommand()
+			return &command.AliasUserAddCommand{Meta: meta}, nil
+		},
+		"aliasusermod": func() (cli.Command, error) {
+			meta.SubCmdName = c.Subcommand()
+			return &command.AliasUserModCommand{Meta: meta}, nil
+		},
+		"aliasuserdel": func() (cli.Command, error) {
+			meta.SubCmdName = c.Subcommand()
+			return &command.AliasUserDelCommand{Meta: meta}, nil
+		},
 		"catchall": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
 			return &command.CatchAllCommand{Meta: meta}, nil