Filter attachments (.bat, .exe, etc..) in postfix

Simple, In /etc/postfix/main.cf enable the body checks with this line:

body_checks = pcre:/etc/postfix/body_checks

Now put something in this file (/etc/postfix/body_checks):

/^(.*)name=\”(.*).(hta|vb[esx]|ws[fh]|js[e]|bat|cmd)\”$/ REJECT

This will filter attachments of various types. Remove from the above line,

whatever you want to allow.Of course you can add some more lines to make postfix a simple spam filter:

/special offer email/ REJECT
/mortgage rates/ REJECT
/other spam mail subjects/ REJECT