Re: Effective Use of Gateway

----- Original Message Follows -----
Date: Tue, 15 Jun 2004 09:41:21 -0700
>
> Hi,
>
> I have a Postfix gateway setup to filter virus and SPAM before my
> Exchange box. I'm finding that some mail seem to slipped through the
> gateway. Those mail should be detected by the gateway. Though I can the
> MX record for the Exchange box to the gateway. How are the mail be
> possibly reach my Exchange box without going through the gateway? Some
> cached entries of my old MX records?
>
> Regards,
> Norman

I used to have that problem. I found that my network was being scanned and
shortly afterwards my internal mail server would get mail sent to it directly.

Changing the configuration of your internal mail server to stop recieving mail
from external machines will resolve that for you. Alternativly you could use a
firewall and allow smtp traffic to only your gateway.


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