Although mail (pop/imap) is working fine, I encounter the following errors in my /var/log/secure. I would like to know how to resolve this as my logwatch mails are getting full. This error is repeated for every valid user on my server. Code: May 5 23:26:32 vps2 dovecot-auth: pam_succeed_if(dovecot:auth): error retrieving information about user [email protected] May 5 23:27:13 vps2 dovecot-auth: pam_unix(dovecot:auth): check pass; user unknown May 5 23:27:13 vps2 dovecot-auth: pam_unix(dovecot:auth): authentication failure; logname= uid=0 euid=0 tty=dovecot [email protected] rhost=213.213.213.213 /var/log/maillog looks ok Code: May 5 23:27:15 vps2 dovecot: pop3-login: Login: user=<[email protected]>, method=PLAIN, rip=213.213.213.213, lip=xx.xx.xx.xx May 5 23:27:15 vps2 dovecot: POP3([email protected]): Disconnected: Logged out top=0/0, retr=0/0, del=0/3, size=4975 It looks like the @ character is causing troubles but I'm not certain. Running ISPConfig Version: 3.0.3.3