Rich wrote:

I moderate a website that sends me messages when I receive a new PM,
or a reply to a message I've posted in. I've received these forever.
All of a sudden I stopped receiving them. I contacted the
administrator of the website who assured me that everything was
working properly on the server end. I double checked all settings in
my website account profile and everything is set properly there. I
contacted my ISP to find out if the domain or website was
black-listed. They were unable to find any indications that the
problem was on their end.

Did you connect to the mailbox on the POP server via a web interface to see
if the messages were there but not being downloaded by Outlook? If not, you
should. If the messages are in the mailbox but Outlook doesn't get them,
then there's a problem with Outlook. If the messages aren't there, then the
problem probably lies on the sender side.
--
Brian Tillman [MVP-Outlook]