--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cmd/sievemgr/info.go	Sat Oct 17 22:40:57 2020 +0200
@@ -0,0 +1,84 @@
+// Copyright (C) 2020 Guido Berhoerster <guido+managesieve@berhoerster.name>
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+package main
+
+import (
+	"fmt"
+	"net"
+)
+
+func init() {
+	cmdInfo.Flag.StringVar(&username, "u", "", "Set the username")
+	cmdInfo.Flag.StringVar(&passwordFilename, "P", "",
+		"Set the name of the password file")
+}
+
+var cmdInfo = &command{
+	UsageLine: "info [options] host[:port]",
+	Run:       runInfo,
+}
+
+func runInfo(cmd *command, args []string) error {
+	if len(args) != 1 {
+		return usageError("invalid number of arguments")
+	}
+
+	host, port, err := parseHostPort(args[0])
+	if err != nil {
+		return err
+	}
+
+	username, password, err := usernamePassword(host, port, username,
+		passwordFilename)
+	if err != nil {
+		return err
+	}
+
+	c, err := dialPlainAuth(net.JoinHostPort(host, port), username,
+		password)
+	if err != nil {
+		return err
+	}
+	defer c.Logout()
+
+	fmt.Println(net.JoinHostPort(host, port))
+	if c.SupportsRFC5804() {
+		fmt.Println("RFC5804 supported")
+	}
+	if c.SupportsTLS() {
+		fmt.Println("STARTTLS supported")
+	}
+	fmt.Printf("SASL mechanisms:\n")
+	for _, m := range c.SASLMechanisms() {
+		fmt.Printf("  %s\n", m)
+	}
+	fmt.Printf("Extensions:\n")
+	for _, e := range c.Extensions() {
+		fmt.Printf("  %s\n", e)
+	}
+	fmt.Printf("Notification methods:\n")
+	for _, m := range c.NotifyMethods() {
+		fmt.Printf("  %s\n", m)
+	}
+
+	return nil
+}

--- a/cmd/sievemgr/main.go	Thu Oct 15 09:11:05 2020 +0200
+++ b/cmd/sievemgr/main.go	Sat Oct 17 22:40:57 2020 +0200
@@ -53,6 +53,7 @@
 	cmdActivate,
 	cmdDeactivate,
 	cmdDelete,
+	cmdInfo,
 }
 
 func usage() {