"Laura H" wrote in message
...

Thanks! You know, I left it alone for a while, and suddenly the test
messages I sent worked. Perhaps the ISP had not fully completed their end
of
the setup. I will absolutely keep your suggestions in mind for future
reference though, as AVG is integrated into outlook.

Current versions of AVG tend to interfere with proper mail communications.
You should uninstall AVG and reinstall it without the Outlook add-ins.
--
Brian Tillman [MVP-Outlook]