/_
/_I can see from the reponses I got on this
/_question that I am obviously missing something. 
/_How is it sendmail, squirrelmail, and IMP are all
/_being recommended to handle (in addition to
/_operating as a web-based front end) IMAP/POP
/_proxying in front of an Exchange server?  How do
/_I configure these to proxy POP or IMAP requests?
/_(i.e. the user is out on the Internet, with a POP
/_or IMAP client, the mail is inside the company,
/_on an Exchange server - I want the client to
/_connect through our firewall to a Linux box in
/_the DMZ that will handle/proxy all the POP/IMAP
/_requests between the client and the Exchange
/_server inside on the LAN. The reason for this
/_config is in order to not have to open the
/_Exchange box to direct connects from the
/_Internet, for security reasons). If this can be
/_done with any regular mail server, my preference
/_would be postfix, as I have experience with it. 
/_Hope this is clear, and thanks again, 
/_
/_Scott
/_
My suggestion had one connecting to an OpenBSD
box at port 443 which in turn redirected to
a web server (IMP). Why couldn't/wouldn't
you do something similar using 110/143 ?
Principle is the same, just a matter of
juggling some redirection around.

Somehow, somewhere, you have to open ports
110/143 on the Exchange. I just think it is a matter
of who/what you allow to connect to those ports.

Or, am I missing something here?

v/r
-Mike