Can sendmail listen for SMTP on two prots at once?

I am trying to work out a roaming solution for clients with notebooks that
don't like webmail and need to send outgoing emails via one of our SMTP
servers. At the moment I have a POP befor SMTP solution running which works
fine except more and more the clients are finding that outbound port 25 in
the hotels they stay at is blocked. I was trying to come up with a way to
get sendmail to listen on two ports at once the normal port 25 and a port
number above 1024 for the roaming users.

Anyone have an idea how to achive that or another roaming suggestion to
bypass the hotel blocks?

- Ernie.
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