Using Outlook 2003 SP2 and all updates. Account is set up as a POP3
account, can receive and reply to mail but can not send new mail
messages. No errors occur, when pressing send the mail goes to the
outbox and then goes to the sent items folder, no error messages. Mail
never gets delivered. I can ping the mail server, can telnet to the
mail server on port 25 and get a 250 ok response when issuing a helo
command.

Her .pst file is 1.15gig in size. Is there a limit to how big a .pst
file can be? I ran the Inbox repair tool and it did find errors but
said it corrected them. At a total loss as what to try next.