Missing emails

I got a new computer and have Outlook 2003 installed. I'm getting my emails
on three accounts. However, I have not been able to receive emails from
yahoo groups. I've checked everything I can think of (spam blockers, rules,
alerts etc) and nothing is telling me why I'm not getting these. I even put
a rule in that tells it to move things from that group to it's own folder.

Lastly...I can tell I'm getting new emails because the envelope pops up with
a little sound...but there are no new emails in any of the folders. It's
like they get downloaded and are immediately erased. This Dell computer came
with Mcafee, but I had a subscription to Nortion Internet Security through
the end of next year. Please give me any suggestions. It's not the end of
the world if I don't get my freecycle emails...but it's bugging me to not
know why they are not coming through...and also it makes me wonder what else
is not coming through.

Thank you!!
Brina