If your linux box is relaying only internally and cannot be accessed 
from the Internet, is it possible that one or more of your other mail 
servers *can* be accessed from the Internet and is trying to bounce 
spam email back to the sender via this linux box?

Are there any clues in your maillog??

Regards, Mike Klinke



On Sunday 22 December 2002 21:25, Nicholas Marsh wrote:
> Sorry, I didn't give enough info in the previous message. Here is
> that I have...
>
> A RedHat box the has 2 NICs, 1 on our internal network and 1 on our
> public network (from our ISP). The RedHat Box acts as a mail relay
> for 2 internal servers. It uses IP Tables for filtering. All the
> internal traffic is masquareded. Everything from the public network
> is blocked.
>
> I was checking the mailq for dead messages and I saw a ton of bounced
> messages. Subject: Cheap p0rn... free passes...
>
> I don't have too many options set in main.cf
>
> myorigin = something.com
> mynetworks_style = class
> #mydestination = $myhostname, localhost.$mydomain
> #relay_domains = $mydestination
>
> I assume I need to do something about relay domains. Any ideas on the
> correct syntax to allow only my internal hosts to send mail?
>
> Thanks!
>
>
>
>
>
>
> nick marsh
> [EMAIL PROTECTED]



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