But the real goal is to put some sort of secure mail server/forwarder between my internal MS Exchange system and the Internet. I don't want to connect Exchange directly to the Internet if at all possible.
What I'm looking for are recommendations for "free" SMTP servers that I can use for this purpose. I would like to include basic anti-virus and SPAM control as well. Unfortunately, I have no money (other than my time) to do this project so am looking at minimal cost products.
Any suggestions for e-mail gateways. I've looked at postfix and qmail but am not sure that they are appropriate. I could use the built in sendmail, but worry about security.
I'm sure either qmail or postfix are perfectly capable of doing what you want - indeed there are many posts about this very subject to the postfix mailing list. I'd suggest looking back through the postfix-users archive to read what has been said in the past.
In particular you'll want to consider how to let postifx know what addresses @yourdomain are valid, so that it only accepts emails that are being sent to valid users. An example of how to do this can be found on http://www.plusone.com/gaptuning/postfix/
I looked at both postfix and qmail for dealing with email for my own small email server, and much prefered postfix.
Oh and, <insert standard comment about how you should just replace Exchange with Postfix anyway>
;)
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