fail2ban/config/filter.d/postfix.conf

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# Fail2Ban configuration file
#
# Author: Cyril Jaquier
#
# $Revision: 267 $
#
[Definition]
# Option: failregex
# Notes.: regex to match the password failures messages in the logfile.
# Values: TEXT
#
failregex = reject: RCPT from (.*)\[(?P<host>\S*)\]: 554