Hi folks,
assuming many AO mbrs are experienced with Mail servers product, I hope to get feedback about the following matter:

I'm looking for a Mail server (and adds-on) that analyze SMTP encapsulated payload and sets rule on what I'd like to get rid of.
A type of HIDS agent for SMTP server with the ability to take action and counter-measure.
e.g. a mail matching the string "commercial in confidence" should not be pushed to a set of remote SMTP relay/servers... (just an example)

[I've seen that postfix has some content filter capability/add-on do u have any feedback?]

cheers,