Blocking mail based on it's content or attachment

[Andrew Chester]

Hi All

I would like to know if there is a way to block mail for a certain domain, 
(with MailScanner sitting on a mail gateway being used for multiple 
domains) based on the mail's content and attachment. Basically, the owners 
of the domain don't want certain file types and certain mail content to be 
received by the users, and thus want it automatically blocked at gateway 
level. We are using Postfix as the MTA on the gateway.

Thanks in advance!

Andrew
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