Then I would try the following settings...
incoming mail server: imap.pitt.edu
outgoing mail server: cwmx.com (from this at&t article...
http://www.wireless.att.com/support/knowledgeBase.do?content=KB72769.html)
add in your username and password and see how it works.
Edit: If you can't send email over 3G or wifi, then the outgoing server may be a problem. If that's the case, then you either need to get an outgoing mail server from Pitt or setup a GMail or Yahoo account and forward your pitt email to there. You could also go to the Computer Science department and probably get some help there.
Message was edited by: paulcb