Because of issues with my ISP I use a vpn much of the time.  The problem is the vpn provider blocks smtp so I can't send email while I'm connected.  Does anyone have an idea how I can bypass the vpn for smtp so I can send email while on the vpn?

I'm running Kubuntu 13.04 and I'm using openvpn.

Thanks to anyone who can help.
Derek
-- 
"I get my copy of the daily paper, look at the obituaries page, and if I’m not there, I carry on as usual."

Patrick Moore