Have a look here:
http://www.google.com/search?sourceid=navclient&q=Symantec+Email+Proxy+Deleted+Message+virus%3F
I just received an email from Symantec with the above subject line.
detail Message properties show only text file as follows:
--------------
From: Symantec Email Proxy
Subject: Symantec Email Proxy Deleted Message
Symantec Email Proxy deleted the following email message:
From: tugcharcoal@yahoo.com
To: "myaddress"@"mydomain".com
Subject: hello
-----
Is this a legitimate email from symantec or..??
Thank You

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic