E-Mail Gateway

[Andrew Boothman]

Wright, Greg wrote:
> 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>

;)

Andrew