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MX Records and Spam Filtering

Posted on 2006-05-07
Medium Priority
Last Modified: 2010-03-19
I run a mail server that doesn't adequately eliminate viruses and spam. This is on a W2K server. I also have a Cobalt Server that runs MailScanner. If domain.com is set up on the W2K server but I point the MX records to a virtual site I have setup on the Cobalt, how do I then tell the Cobalt to send the mail back to the W2K server once scanned.

I have setup DNS at the moment to:

mail.domain.com - IP of W2K
MX - Spamfilter.virtualsite.com (On Cobalt)

If I send an email, it correctly goes to the Cobalt but I get:

SYSERR(root) MX list for domain.com points back to (hostname of cobalt)

I have added the domain to the allowed domains for relaying on the Cobalt.

Question by:helpint
LVL 18

Accepted Solution

Sam Panwar earned 500 total points
ID: 16627469
LVL 12

Assisted Solution

pjtemplin earned 500 total points
ID: 16627599
Most Mail Transfer Agents (MTAs) do one of three things: they accept mail for a domain name, they relay mail for a domain name, or they reject mail for a domain name.  The program on the Cobalt is only called if the Cobalt accepts the mail as local, but you don't want the mail to actually be accepted locally.  If you configure forwarding settings, the software on the Cobalt may forward the mail before actually checking for bad stuff.

You may need to contact the software firm to see if there is a way to use it in the manner you wish to use it - it might not work in this scenario.

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