diff --git a/cmd/mailfull/command/aliasdomainadd.go b/cmd/mailfull/command/aliasdomainadd.go
new file mode 100644
index 0000000..41d1222
--- /dev/null
+++ b/cmd/mailfull/command/aliasdomainadd.go
@@ -0,0 +1,80 @@
+package command
+
+import (
+	"fmt"
+
+	mailfull "github.com/directorz/mailfull-go"
+)
+
+// AliasDomainAddCommand represents a AliasDomainAddCommand.
+type AliasDomainAddCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *AliasDomainAddCommand) Synopsis() string {
+	return "Create a new aliasdomain."
+}
+
+// Help returns long-form help text.
+func (c *AliasDomainAddCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s domain target
+
+Description:
+    %s
+
+Required Args:
+    domain
+        The domain name that you want to create.
+    target
+        The target domain name.
+`,
+		c.CmdName, c.SubCmdName,
+		c.Synopsis())
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *AliasDomainAddCommand) Run(args []string) int {
+	if len(args) != 2 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+
+	aliasDomainName := args[0]
+	targetDomainName := args[1]
+
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	aliasDomain, err := mailfull.NewAliasDomain(aliasDomainName, targetDomainName)
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	if err := repo.AliasDomainCreate(aliasDomain); 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/aliasdomaindel.go b/cmd/mailfull/command/aliasdomaindel.go
new file mode 100644
index 0000000..a16411c
--- /dev/null
+++ b/cmd/mailfull/command/aliasdomaindel.go
@@ -0,0 +1,71 @@
+package command
+
+import (
+	"fmt"
+
+	mailfull "github.com/directorz/mailfull-go"
+)
+
+// AliasDomainDelCommand represents a AliasDomainDelCommand.
+type AliasDomainDelCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *AliasDomainDelCommand) Synopsis() string {
+	return "Delete a aliasdomain."
+}
+
+// Help returns long-form help text.
+func (c *AliasDomainDelCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s domain
+
+Description:
+    %s
+
+Required Args:
+    domain
+        The domain name 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 *AliasDomainDelCommand) Run(args []string) int {
+	if len(args) != 1 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+
+	aliasDomainName := args[0]
+
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	if err := repo.AliasDomainRemove(aliasDomainName); 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/aliasdomains.go b/cmd/mailfull/command/aliasdomains.go
new file mode 100644
index 0000000..62cbac7
--- /dev/null
+++ b/cmd/mailfull/command/aliasdomains.go
@@ -0,0 +1,75 @@
+package command
+
+import (
+	"fmt"
+	"sort"
+
+	mailfull "github.com/directorz/mailfull-go"
+)
+
+// AliasDomainsCommand represents a AliasDomainsCommand.
+type AliasDomainsCommand struct {
+	Meta
+}
+
+// Synopsis returns a one-line synopsis.
+func (c *AliasDomainsCommand) Synopsis() string {
+	return "Show aliasdomains."
+}
+
+// Help returns long-form help text.
+func (c *AliasDomainsCommand) Help() string {
+	txt := fmt.Sprintf(`
+Usage:
+    %s %s [domain]
+
+Description:
+    %s
+
+Optional Args:
+    domain
+        Show aliasdomains that the target is "domain".
+`,
+		c.CmdName, c.SubCmdName,
+		c.Synopsis())
+
+	return txt[1:]
+}
+
+// Run runs the command and returns the exit status.
+func (c *AliasDomainsCommand) Run(args []string) int {
+	if len(args) > 1 {
+		fmt.Fprintf(c.UI.ErrorWriter, "%v\n", c.Help())
+		return 1
+	}
+
+	targetDomainName := ""
+	if len(args) == 1 {
+		targetDomainName = args[0]
+	}
+
+	repo, err := mailfull.OpenRepository(".")
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+
+	aliasDomains, err := repo.AliasDomains()
+	if err != nil {
+		fmt.Fprintf(c.UI.ErrorWriter, "[ERR] %v\n", err)
+		return 1
+	}
+	sort.Sort(mailfull.AliasDomainSlice(aliasDomains))
+
+	for _, aliasDomain := range aliasDomains {
+		if targetDomainName != "" {
+			if aliasDomain.Target() == targetDomainName {
+				fmt.Fprintf(c.UI.Writer, "%s\n", aliasDomain.Name())
+			}
+		} else {
+			fmt.Fprintf(c.UI.Writer, "%s\n", aliasDomain.Name())
+		}
+	}
+
+	return 0
+}
diff --git a/cmd/mailfull/main.go b/cmd/mailfull/main.go
index ce03c5c..f67cef6 100644
--- a/cmd/mailfull/main.go
+++ b/cmd/mailfull/main.go
@@ -55,6 +55,18 @@ func main() {
 			meta.SubCmdName = c.Subcommand()
 			return &command.DomainDelCommand{Meta: meta}, nil
 		},
+		"aliasdomains": func() (cli.Command, error) {
+			meta.SubCmdName = c.Subcommand()
+			return &command.AliasDomainsCommand{Meta: meta}, nil
+		},
+		"aliasdomainadd": func() (cli.Command, error) {
+			meta.SubCmdName = c.Subcommand()
+			return &command.AliasDomainAddCommand{Meta: meta}, nil
+		},
+		"aliasdomaindel": func() (cli.Command, error) {
+			meta.SubCmdName = c.Subcommand()
+			return &command.AliasDomainDelCommand{Meta: meta}, nil
+		},
 		"commit": func() (cli.Command, error) {
 			meta.SubCmdName = c.Subcommand()
 			return &command.CommitCommand{Meta: meta}, nil