deleting messges

I have a problem since 5 july that norton can't solve.  Many arriving messages are rejected with comment  "Symantec Email Proxy deleted the following email message:

The same with my outgoing messgages, they don't arrive at destination butbut the same line "Symantec Email Proxy deleted the following email message:" is displayed at destination.

Some one has a solution?  When we deled Norton 360 everythings become normal so mayby I should go to <Webroot