Hello, I had some problems with postfix. Did some edits in master.cf and main.cf and after that I noticed that the mail settings were missing in the ispconfig gui. This gives me several errors, even after filling in the default settings the message "Uid-mapping cannot be changed if there are already mail users." keeps coming back. Is there a way to get this working again ? Reset ? I cannot configure DKIM because the path is missing. Postfix is running ok now. Thanks in advance, Edwin Maildir Path is empty. Invalid maildir path. Homedir Path is empty. Invalid homedir path. Mailuser uid must be >= 2000 Mailuser gid must be >= 2000 Mailuser Name is empty. Invalid mailuser name. Mailuser Group is empty. Invalid mailuser group name. Uid-mapping cannot be changed if there are already mail users.