Got some errors after weekend. First of all webmail: Webmail output this message: imp is not configured in the Horde Registry. After this do: apt-get remove psa-horde Go to plesk Backend -> Server ->updater Update Plesk Get no status mail, after a while i tried the updater again, says all is fine. go to webmailer and git the same error message. The next problem is qmail or else. If i try to get pop3 messages, username / password didnt work. Via SSH i do the following commands: /usr/local/psa/admin/bin/mchk --with-spam /usr/local/psa/admin/sbin/mail_auth_dump /usr/local/psa/admin/sbin/mail_auth_view mail_auth_view shows the correct username and password but SMTP/POP3 doesnt work. username to resolve or send mail was send with @domain and without.