RW> Yes, but unless MX records can be updated to reflect systems running SMTP
RW> mail servers on alternate ports, this may be a moot point since most mail
RW> servers deliver mail on port 25.

We run our own SMTP server as a "hub" for WWIVnet.  A simple
redirect on the firewall can take inbound tcp/2525 and forward it to tcp/25
on the inside. 
This way, the hub can receive tcp/25 (since their ISP isn't blocking SMTP)
and others can send to it on tcp/2525 also.

Technically, even someone that has a blocked SMTP could run the server -
provided all nodes sent packets on tcp/2525.  

Long term, I'm looking at adding SMTP AUTH - but in the short term, there is no need.

- Mark

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