how to reject mails from senders claiming to be in my domain?

[tilli]

Hi,

does anyone know how to reject messages from senders claiming to be in one of the domains we do relaying for? I don't see a possible access-db-solution...

(not working) example for access.db:

Connect:[192.168.0.1] RELAY
To:my.domain.com RELAY
From:my.domain.com REJECT

"OK" instead of "RELAY" also fails. How can I block mails with sender and recipient from my domain (or at least the same domain)?

Thanks for help!
Tilli

 

[fluffybunny]

You probably have the option relay_local_from set in your sendmail.mc file. Remove it and replace it with either relay_entire_domain or relay_hosts_only.

Regards.

 

[tilli]

Our machines don't deliver local mail, they are for relaying only. So there is no need for elay_local_from.

relay_entire_domain is for relaying every mail from or to our local domains, but that works already.

We do not use the "relay-domains" file so relay_hosts_only would not have any effect.

I would like to know if there is a hack or a feature to control relaying problems as described via entries in the access.db.

Thanks,
Tilli