[GRLUG] Sendmail as secondary (backup) MX

[Chris Lamrock]

Hey Ben -

You should be able to set up a primary MX server and use it as a gateway to 
your main mail server.
I have a similar configuration here however my primary MX server runs DSPAM 
and postfix which
forwards the "good" emails to my email server running sendmail.  Of course I 
also use DSPAM
for our anti-spam protection - but I'm sure you could set up postfix to 
check a virtuser table and then
forward or not...    By the way - DSPAM works good for us...


-Chris


----- Original Message ----- 
From: "Benjamin Eavey" <ben at eavey.com>
To: <grlug at grlug.org>
Sent: Tuesday, October 31, 2006 10:36 AM
Subject: [GRLUG] Sendmail as secondary (backup) MX


> Has anyone set this up and worked out all the kinks?  I have a machine
> running Sendmail and acting as a backup MX for several domains.
> Everything has been working fine, for the most part, but now I'm running
> into problems with the queue becoming overloaded.
>
> It looks like a bunch of spam, and it appears to be a bunch of "550 -
> undeliverable" messages and other similar stuff.  Looks like the
> spammers are sending to non-existent addresses at the domains I host,
> which are then bouncing with "undeliverable" messages, which are then
> building up on my sendmail server, which is trying to deliver them to
> the spoofed originating email addresses.
>
> I know this is bad, and I'm pulling my hair trying to figure out how to
> make this work properly, but I'm not getting anywhere.
>
> Can anyone offer any suggestions?  Am I explaining this well enough that
> the problem makes sense?
>
> Thanks,
>
> -Ben
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