E-mail will not leave computor

A

alan

I switched ISPs and started having a problem sending e-
mails. I can write an e-mail, put it in the outbox, and
when I get online it will transfer to the sent box, show
to be sent, but never leave my PC. It never goes out.
If I am online and try to send an e-mail it goes straight
to the sent box, but never goes out.
Any ideas where the problem may be, or how to fix, would
be apprecieated.
The ISP guys say the connection parameters are correct.
I have no problem recieving mail.
 
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