SMTP and ports 25 and 1025.

["Easthope" <peasthope@cablelan.net>]

Debian Users,

I am trying to understand how SMTP uses ports.
Ultimately I want it to work through a SSH tunnel.

Normally SMTP uses port 25 but in some cases it uses 
1025.  According to 
http://www.iana.org/assignments/port-numbers 
1025 is assigned to blackjack!  (blackjack?)  So what 
is SMTP doing with it?

Thanks,                    ... Peter E.