> Not sure what you're trying to say here. There's no problem resolving
> the name (smtp.wcox.com). They can, when they are having the problem,
> drop to a command prompt and ping/tracert without problem. But, they
> cannot 'telnet smtp.wcox.com 25' - get a timeout with that also.

Then port 25 blocking on the remote ISP is almost certainly the problem.  If they get 
a timeout telneting to port 25, but not port 110, it's almost certainly port 25 
blocking.  If they can't get to port 25 (and can get to port 110), and you can get to 
port 25 locally, you can be sure that the remote ISP is blocking access to port 25.
 

--
                      -Scott

Declude: Anti-virus and Anti-spam solutions for IMail.  http://www.declude.com
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