I scan incoming mail with bogofilter. Here is the related part of master.cf :
smtp inet n - n - - smtpd -o content_filter=filter: -o receive_override_options=no_address_mappings filter unix - n n - - pipe flags=Rq user=filter argv=/usr/local/etc/bogofilter/postfix-filter.sh -f ${sender} -- ${recipient} Is it possible to not filter if sender IP is in list.dnswl.org <http://list.dnswl.org/> using master.cf or main.cf ? Or the only way is to rewrite postfix-filter.sh script and add the check there?