Outlook Express works fine but Outlooks get error messages, why?

[Tony]

I can receive email from my pop server just fine. I cannot send emails to
anyone or return receipt requests. It appears to me that all works fine
until its time to send a message.

I used the same pop settings in Outlook express and everything works fine.
I would prefer to use the features in Outlook that are not available in
Express.

Thanks

 

[Peter Foldes]

Turn off your Anti Virus email scanner and try. You will still be protected
with your resident AV

 

[Tony]

That didnt make any difference, but thanks for the effort. I got the
following error report:
"None of your e-mail accounts could send to this recipient."
Tony