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Editing: sendmail-auth.conf
# Fail2Ban filter for sendmail authentication failures # [INCLUDES] before = common.conf [Definition] _daemon = (?:sendmail|sm-(?:mta|acceptingconnections)) # "\w{14,20}" will give support for IDs from 14 up to 20 characters long __prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )? addr = (?:IPv6:<IP6>|<IP4>) prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$ failregex = ^(\S+ )?\[%(addr)s\]( \(may be forged\))?: possible SMTP attack: command=AUTH, count=\d+$ ^AUTH failure \([^\)]+\):(?: [^:]+:)? (?:authentication failure|user not found): [^,]*, (?:user=<F-USER>(?:\S+|.*?)</F-USER>, )?relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$ ignoreregex = journalmatch = _SYSTEMD_UNIT=sendmail.service # DEV Notes: # # Author: Daniel Black
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