way to allow using internet account for sending when offline

Is there are any way to do the following:

User does a sync before leaving the office that has the exchange server. They 
use it in offline mode when on the road.  Now they want to send some messages 
via a regular internet smtp account as the exchange server is not available.

Context

Exchange 2003 at the office, only access currently is via OWA (https), 
laptops have outlook 2000 on them.

I am not going to open pop3 or smtp to the users when they are out of the 
office.  However this specific user needs to be able to create and reply to 
emails while he is sitting on the ferry or the plane in transit and then be 
able to send when he gets to an internet connection at the hotel or wherever.

Suggestions?

-- 
Harondel J. Sibble 
Sibble Computer Consulting
Creating solutions for the small business and home computer user.
help@xxxxxxxxx (use pgp keyid 0x3AD5C11D) http://www.pdscc.com
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