How to force postfix not to send emails?

Question

postfix

How to make postfix send messages only by "postfix flush", and put all outgoing messages in the queue? Those. I want to make exclusively manual sending of all correspondence at once. Thank you!

Answer 1

create a header_check and write a filter there with a criterion that you yourself define according to your headers. For example
/^Received: from my_criteria/ HOLD
in main.cf
header_checks = regexp:/etc/postfix/header_checks
at the right time postsuper -H ALL
something like this