mailinabox/conf/fail2ban/filter.d/miab-postfix-rdnsfail.conf

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[INCLUDES]
before = common.conf
[Definition]
miab-errors=postfix/(submission/)?smtpd.*warning: hostname .* does not resolve to address <HOST>:.+
miab-normal=postfix/(submission/)?smtpd.*warning: hostname .* does not resolve to address <HOST>$
ignoreregex =
failregex = <miab-<mode>>
mode = normal