Bad email prevents checking email

[TW News]

My Outlook 2000 throws an error message 2-3 times a weeek that it cannot
connect to the server...
When I look at my mailbox in Exchange2000 server (using OWA), I see my mails
waiting there.

But I see one email that has no To: or From: information, everything is
just empty.
As soon as I manually delete this email from my mailbox, I can download rest
to my Outlook fine.

How can I stop this blank emails? How can a blank email causing me to stop
receiving emails?

Any ideas?

Thanks in advance...