> Check the exchange server to see if it does relay, and if you are
> worried about it stick the exchange server behind a box
> running postfix
> or something similar, if it needs to receive SMTP mail.
Or you could just configure Exchange properly - it only takes a minute
(Routing Restrictions on the Routing Tab in the Internet Mail Service
Properties in Exchange Admin - just add your internal address range and
restart the Internet Mail Service). I decided to stick exim in front of our
server though because its easier to keep it patched - no harm to do both.
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