Someone’s spamming with my return address, will you blacklist me?

No. The From field in most spam is forged and meaningless. Some spamware uses addresses from the spammer’s “To” list to also fill in the “From” address. Usually that is just a random selection, but occasionally spammers “bounce bomb” a particular recipient with thousands of forged return-paths forged in the victim’s name, either out of …

Postfix Backscatter Howto

Overview This document describes features that require Postfix version 2.0 or later. Topics covered in this document: What is backscatter mail? How do I block backscatter mail to random recipient addresses? How do I block backscatter mail to real recipient addresses? Blocking backscatter mail with forged mail server information Blocking backscatter mail with forged sender …