fail2ban/config/filter.d/sasl.conf

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# Fail2Ban configuration file
#
# Author: Yaroslav Halchenko
#
# $Revision: 331 $
#
[Definition]
# Option: failregex
# Notes.: regex to match the password failures messages in the logfile.
# Values: TEXT
#
failregex = : warning: [-._\w]+\[(?P<host>[.\d]+)\]: SASL (?:LOGIN|PLAIN|(?:CRAM|DIGEST)-MD5) authentication failed$