i want to block email attachments by users inside our campus. i.e., Nobody allowed to send attachments....

we are using qmail as mail server ,Shorewall firewall with squid proxy server in RedHat Enterprise As4.

In which way , it is possible? using Squid or Shorewall or Qmail?

i have seen some examples here. but that is for not downloading mail attachments only......

help me

by kalidoss.s