If you have integrated with Apache SpamAssassin, then v3.4.3 introduces the ability to do RBL lookups on the domain in Reply-to as well as the ability to do hashed lookups.
Regards, KAM On 12/11/2019 9:38 PM, li...@lazygranch.com wrote: > I have a spammer who uses all sorts of "from" addresses but the same > "reply" address. Any way to block this spammer in Postfix.