fail2ban/config/filter.d/sendmail-auth.conf

# Fail2Ban filter for sendmail authentication failures
#

[INCLUDES]

before = common.conf

[Definition]

_daemon = (?:sendmail|sm-(?:mta|acceptingconnections))

failregex = ^%(__prefix_line)s\w{14}: (\S+ )?\[(?:IPv6:<IP6>|<IP4>)\]( \(may be forged\))?: possible SMTP attack: command=AUTH, count=\d+$

ignoreregex =

journalmatch = _SYSTEMD_UNIT=sendmail.service

# DEV Notes:
#
# Author: Daniel Black