Hello, For those who want to implement a Groupware solution on their servers with ISPConfig 3. I have made some modifications to the Horde filters manager (Ingo) in order to synchronize the information with ISPConfig. With this modification you can synchronize Blacklist, Whitelist, Vacation, Filters and Forward (@TODO Spam) The commit can be found here: https://github.com/horde/horde/pull/159 This commit is for Ingo v3.3.0, but I have a running modification for v3.2.6 which I want to commit to see if they can release as an update within the same version. Please note: This backend require some special configuration. Please search for ISPConfig3 in the backends.php and hooks.php.dist files. Also you must uncheck in the Ingo configuration -> Rules Options -> $conf[rules][userheader] I leave this conversation open in order to receive your opinions and suggestions.