You could be sending out Spam e-mail and not even know it.
I have one site hosted by godaddy,com that started sending me emails with "Cannot send error" messages
when i looked at the email addresses sending these messages they weren't mine, but somoeone who had hacked into godaddy (either directly or through my portal) and was creating and sending emails through names they made on my domain. (via
whatever@mydomain.com)
When I contacted godaddy about this, they told me to turn off the catch all feature of my main account. All this would do, would to be keep me from getting the messages. They offered no relief from the problem except that they would check into it.
Bottom line is somebody could be using your domain name to send spam and you wouldn't even know about.... call your hoster and make sure this is not the case.
If you are clean, then call McAffee and blow a spleen.