Write a script to do content filtering with postfix

Question

How can i write in python or ruby a script to do content filtering in postfix via smtp or uucp (not pipe)? There is some examples?

Answer 1

If you don't need the whole mail body to process it, you could simply write a policy server for Postfix, see Access policy delegation.

If you need to process the whole mail, you have several possibilities, see Postfix Content Inspection.

You could either implement a content filter (see FILTER_README) which gets the mail via SMTP or LMTP and, after processing it, sends it back to Postfix through SMTP, or you could implement a milter, for which appropriate libraries for Python exist.