Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I know how to use header_check... but it works only on upcoming emails. I have to analyze the header again after the email is deferred and send it through different transport. The transport should be a script that analyze the content of the email and updates database with some information.

Any idea what I can use in postfix to create such a behavioral.

share|improve this question

The way I would approach that is to use an smtp_fallback_relay to handle delivery of the deferred messages. You'll have to setup a 2nd postfix server or instance for the fallback relay, but it can have it's own set of checks that are independent of the primary.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.