Phantom "New Message Received"

murman <[email protected]> Thu, 26 Jan 2006 00:40:31 GMT
Newsgroups gmane.comp.mozilla.devel.mac
Organization EarthLink Inc. -- http://www.EarthLink.net
Message-ID <[email protected]>
I am getting the little green arrow and a beep showing that a new 
message has been received, but when I click on the inbox, there is 
nothing. No junk mail box set up, so what's  happening? TIA