[ILUG] Advice

[Reilly, John]

> 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.