I have enabled the DNSBL feature (bl.spamcop.net, psbl.surriel.com, bl.spamcop.net, noptr.spamrats.com, spamrbk.imp.ch, db.wpbl.info, zen.spamhaus.org) the way this is 6 months. But PMG today I do not know why some external emails sent to pmg are rejected.
Error:
Postfix / postscreen pmg...