[courier-users] Filtering question ...

Ok, let me se if i can explain this:

This is my setup:

internet ----> filtering server ----> mail server (courier)

I want to stop mail from going directly to the mailserver. Some
viuses apperantly do something like this

take xxx@domain.com and try deliver it firectly to
[pop3,mail,etc].domain.com

Under other cirumstances i could just firewall the mailserver to onyl
accept incomming mail from the filter, but this server is also in use
as an outgoing smtp relay for my customers. Now, how do i filter/
ristrict my mail flow, so that mail from the filter and mail from my
clients for relay get acceptet, but mail from the outside to the
domains hosted on the mail server get's bounced, or redirected to the
filter ?


I hope i made myself clear .. any suggestions on how to do this in
courier ?

/thomas




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