Secure POP over SSH

[Pollywog]

I read the docs at http://www.linuxdoc.org/HOWTO/mini/Secure-POP+SSH.html 
and I am wondering whether this approach can work for multiple mailboxes 
at one ISP (if I use fetchmail).  What I am almost sure will happen is 
that before the SSH tunnel is disconnected for one mailbox, fetchmail will 
try to retrieve mail for the next mailbox.  I don't want to set up a 
different port for each mailbox because I think that would be an abuse of 
my ISP.  I want fetchmail to use SSH to retrieve mail one mailbox at a 
time.

thanks


--
Andrew