missing viruses

We are running Sophie 3.81 with the newest version of Sophie, and recently
have been noticing a lot of worms getting through.  I have especially seen
several variants of Bagle that Sophos is supposed to stop making it past,
but I also have seen what Norton recognized as MHTMLRedir.Exploit come
through email.  Anyone else having this trouble?  I have sent several sample
messages to Sophos support, but haven't heard anything back yet and it has
been a couple of days.  I was thinking about running Clam as a backup (scan
things twice).  Does anyone know if Clam would catch these that are getting
through?


Trey