Peter Brown wrote:

Suddenly about 10 days ago emails that I sent stopped arriving at
their destination. I can use the internet and receive emails using
the same ISP account. Emails leave the outbox, but never arrive. I've
tried sending emails to myself with no luck. I've double checked all
the email settings with the ISP's techno dept and all is fine. I've
done a system restore to a time when I know that emails worked, still
no luck.

Enable diagnostic logging and see if the messages are accepted by the SMTP
server. If they are, the problem lies with your ISP and you'll be able to
prove it with the log so they can't say, "It's an Outlook problem." See
this:
http://support.microsoft.com/kb/240347/en-us
--
Brian Tillman