Help!

I have recently downloaded the Outlook 2007 Trial (valid until 31 July) to
evaluate Outlook to handle my free AOL account. After set-up, it worked
great and I have intended to buy when the trial expires. However, yesterday,
it stopped sending e-mail. I receive a msg from system administrator stating:

Your message did not reach some or all of the intended recipients.

Subject: test
Sent: 7/20/2007 1:26 PM

The following recipient(s) cannot be reached:

' on 7/20/2007 1:27 PM
554 TRANSACTION FAILED

I have not changed anything. I re-checked my server settings per the AOL
help at link:

http://help.aol.com/help/search.do?c...200%2037567607

....and all look correct. It even sends me a test e-mail at the end of the
config wizard and reports success. Strangely, I can send e-mails to myself,
but to no one else, AOL or otherwise.

Any ideas out there in smartguyland?

I will attempt re-install otherwise.

Thanks for any assistance,
Scott