Me again! I installed ISPConfig 3, followed this tutorial: https://www.howtoforge.com/tutorial...l-pureftpd-bind-postfix-doveot-and-ispconfig/ Installation went like a charme. After adding a lot of e-mail accounts to this server and wondering why I can't connect, I found this entry in the e-mail error log: Code: Jun 11 08:18:27 server100 dovecot: imap: Error: Internal auth failure (client-pid=11084 client-id=1) Jun 11 08:22:39 server100 dovecot: auth-worker(13833): Error: sql([email protected][email protected][email protected][email protected] So, none of the entered e-mail accounts were created on the server. The directory of /var/vmail is empty. How can I fix that and how can I get those e-mail accounts being created afterwards? How can I prevent this situation on installation?