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Old 11-07-2005, 02:30 PM   #1
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Registered: Nov 2005
Distribution: Gentoo, Red Hat, Slackware
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POSTFIX Gurus... Help!

I've set up a SPAM/Virus filter gateway INTO my network. The SPAM/Virus filtering works great.

The only issue I'm having is with Postfix.

Ok, here is what I want this mail gateway to do:

* Take mail sent from ANYWHERE in the world (regardless of domain), filter it and then RELAY it INTO my network ONLY.

* Reject Relay for domains that are NOT in my transport_map

I have 1500 domains, so this is not a single domain gateway, is not relaying to a single server, the accounts I'm relaying to are VIRTUAL, and there are NO local mail accounts - just pure Filter & Relay. Thats it.

The only way I've been able to make this work is by putting in $mynetworks - essencially making it an open relay... to EVERYWHERE, not just my network.

I have $relay_domains set to $transport_map, but I still see in my log files people ?successfully? relaying to other domains. I have only one domain in my transport_map for testing purposes.

I've done a few open relay tests and they said that the machine ISN'T an open relay - but I see my spam filters catching those tests - and actual spammers.

Let me give you a layout of what I'm trying to do (The customer's MX records point to this gateway):

* Anonymous Internet Client sends an E-mail to my customers
* The gateway accepts the mail for Relay (if in $transport_map), and REJECTS RELAY if not
* The gateway keeps the accepted mail in queue while it is being Virus/SPAM filtered
* Once the message passes the tests, it is relayed to my mail servers

It's just a ONE-WAY (IN) Filter box.

If I remove from $mynetworks, every external client is rejected. Period.

This machine is meant to be a SPAM/Virus filter for Incoming E-mail to those 1500 domains, and thus rejecting anonymous mail addressed to those domains instead of relaying it inside is unacceptable.

I'm not trying to make an open relay - just an anonymous filtering gateway into my network ONLY. But as I said above, making it an open relay has been the only way it's worked.

Thanks in advance,
Old 11-08-2005, 03:03 AM   #2
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Registered: Oct 2003
Location: Western Australia
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i don't use it but as you posted twice you may want to check out


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