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
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source:http://linuxpoison.blogspot.com/2007/12/135781758014216.html