On Tue, 25 Nov 2025, Wietse Venema via Postfix-users wrote:
Date: Tue, 25 Nov 2025 16:08:36 -0500 (EST)
From: Wietse Venema via Postfix-users <[email protected]>
Reply-To: Wietse Venema <[email protected]>
To: Postfix users <[email protected]>
Subject: [pfx] Re: Getting bounced email that I did not send
Al and Jeanie Zick via Postfix-users:
Hi,
Maybe someone has some ideas on this. My inbox is full of bounces, thousands
ever day. I check my logs and these emails are not going through my mail
server. I also updated my config but there was no change. It looks like some
spammer sends an email, then a real mail server accepts it, then decides it
can't deliver it, and then it bounces back to me. Checking my server logs shows
that it is returned from a different server every time. Also, it was sent from
a random email of mine. Is there a defense against this kind of attack? Can I
somehow limit it so only my mail servers can send emails for my domains? Or is
there a way to block the bounces?
Do you have a wild-card pattern that accepts email for *every*
address in your domain? Stop doing that.
This was the first problem. After changing this most bounces stopped.
https://www.postfix.org/BACKSCATTER_README.html has some ideas for
sites that don't use wildcard patterns.
I also read through this and made additional changes to my config. It
seems to be stopping all bounces now.
Kind Regards,
Al
_______________________________________________
Postfix-users mailing list -- [email protected]
To unsubscribe send an email to [email protected]
