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

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# Fail2Ban filter for sendmail spam/relay type failures
#
# Some of the below failregex will only work properly, when the following
# options are set in the .mc file (see your Sendmail documentation on how
# to modify it and generate the corresponding .cf file):
#
# FEATURE(`delay_checks')
# FEATURE(`greet_pause', `500')
# FEATURE(`ratecontrol', `nodelay', `terminate')
# FEATURE(`conncontrol', `nodelay', `terminate')
#
# ratecontrol and conncontrol also need corresponding options ClientRate:
# and ClientConn: in the access file, see documentation for ratecontrol and
# conncontrol in the sendmail/cf/README file.
[INCLUDES]
before = common.conf
[Definition]
_daemon = (?:sm-(mta|acceptingconnections))
failregex = ^%(__prefix_line)s\w{14}: ruleset=check_rcpt, arg1=(?P<email><\S+@\S+>), relay=(\S+ )?\[<HOST>\]( \(may be forged\))?, reject=(550 5\.7\.1 (?P=email)\.\.\. Relaying denied\. (IP name possibly forged \[(\d+\.){3}\d+\]|Proper authentication required\.)|553 5\.1\.8 (?P=email)\.\.\. Domain of sender address \S+ does not exist|550 5\.7\.1 (?P=email)\.\.\. Rejected: .*)$
^%(__prefix_line)sruleset=check_relay, arg1=(?P<dom>\S+), arg2=<HOST>, relay=(?P=dom) \[(\d+\.){3}\d+\]( \(may be forged\))?, reject=421 4\.3\.2 Connection rate limit exceeded\.$
ignoreregex =
# DEV Notes:
#
# Author: Daniel Black and Fabian Wenk