The email system suddenly stopped working today. Postfix and Dovecot are running. What I'm seeing with "tail -f /var/log/mail.log" and trying to connect to one of the email accounts with my phone is lots of disconnections: "dovecot: disconnection before auth was ready" "smtpd: lost connection after CONNECT from..." "imap: connection closed" So it appears that all connections to postfix / dovecot are being prematurely cut off almost immediately. When I try to send an email to or from the email account, it's not delivered but it also doesn't bounce either. It just vanishes into the ether. Is this SpamAssassin or Fail2Ban getting far too eager - forcing a disconnect - and actually banning any emails from working at all?