Hi, One of my mail servers (Postfix 3.1.0), is configured to perform virtual domain hosting. It forwards mail to the virtual domain to mailboxes of users on Gmail.
I can see in my mail log that spam with forged origin addresses sometimes comes into my server that is addressed to virtual domain addresses. My server rejects some of this spam and then generates a non-delivery e-mail to the origin address of the spam. Of course, as some of those addresses are forged, my server is producing backscatter. I read the “Backscatter Howto” [1] on the Postfix website, but from what I read this appears to address backscatter when someone is forging the origin address of spam to be from my server (resulting in accounts on my server getting the non-delivery e-mails). I am looking to correct backscatter that my server generates. I believe I read that non-delivery e-mails should be disabled and my server should generate a 5.x.x SMTP error code. Is this correct ? If so, how do I implement this in main.cf ? Thanks, - J Sources: [1] http://www.postfix.org/BACKSCATTER_README.html
