Bellow are logging outputs of this software. These examples should be detected by Fail2ban. Please remove any confidential information before saving this page. Change IP addresses to 192.0.2.0/24.
If the offending host is not trivially visible in the logging output, please give more detailed information.
Postfix 2.3.8 - Dovecot SASL
- Jan 7 11:36:41 emailserver postfix/smtpd: warning: email.cacert.org[192.0.2.19]: SASL PLAIN authentication failed: