[Spambayes] Server side filtering.

[Tim Casey]

I'm an administrator at a large company that uses an exchange server.  I
would like a spam filtering solution that is transparent to the user. Has
any of your group had experience setting up a mail relay that would filter
mail and then relay it to another email server?  The client side solution
works well but deployment, training, administration etc. would be a pain.
Here's my idea of a idea of a perfect world.


                                                   
       Internet-----> Spamfilter / Relay ------>Firewall ----->Exchange
Server ----->Client ------
                                        ^
V                         
                                        I
|                           
                                        |
Junk Email    
                                        I
V                                                                   I
----------------------------------------------------------------------------
-----------           

Simply put I would like to set up a mail relay that would use spambayes and
forward to my Exchange server.  Once the client receives the email they
could send email to a junk file that would be polled by the Spamfilter /
Relay for training spambayes.  All mail on the Spam Filter deemed junk would
be reviewed by an administrator prior to deleting.  

Any suggestions?

Thank you,

Tim