On Fri, May 08, 2009 at 12:20:26PM -0400, Comtois, Andre wrote:
>
> I'm having mixed results getting this to work. My postfix server
> accepts emails and relays them to the exchange server just fine, however
> it also seems to have no issues relaying emails to gmail.com as well, so
> I'm not sure how to restrict it to only accepting messages destined for
> my domain.
http://www.postfix.org/BASIC_CONFIGURATION_README.html#relay_from
http://www.postfix.org/BASIC_CONFIGURATION_README.html#relay_to
If your receiving system in the DMZ is behind a NAT device that translates
source addresses from the Internet to a fixed DMZ source IP address,
be SURE TO EXCLUDE that address from "mynetworks". Be sure to not NAT
internal clients (your Exchange servers), or NAT them to a different IP.
Of course, you really should NOT NAT source addresses at all, with source
IPs masked you can't use RBL lists, and your logs are much less useful.
--
Viktor.
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