postfix.org is what we (www.sjobeck.com) use as the internet-facing point in ingress for all, and all our client's, email, and it works like a dream. I highly advise more organizations get someone who knows Linux or *BSD to throw postfix on to, and put it in front of your Exchange/GroupWise/etc/etc/etc server. You can run it on a very humble piece of hardware, perhaps even a recycled desktop or whatever else appropriate you have laying around, takes few hours to get up-n-running, a couple weeks of fine tuning & tweaking (ie: start very slowly with anti-spam mechnisms in postfix, amavisd, spamassassin, razor, pyzor, bayes, clamav, etc) to get it tweaked just right for your organization, and you'll love it.

Cheers.

Jason SJOBECK

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Link to this comment: http://www.securityfocus.com/comments/articles/11388/33728#33728