Sure, just configure strict SPF, sign all emails with DKIM & configure DMARC as p=reject sp=reject
-- *Best Regards,* Dmitriy Alekseev DevOps Engineer On Tue, 25 Nov 2025, 21:49 Al and Jeanie Zick via Postfix-users, < [email protected]> wrote: > 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? > > Kind Regards, > Al > > > _______________________________________________ > Postfix-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] >
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