Hi,
We got a request to match the envelope sender with a certain mail header (i.e. X-Something) on our relay servers for every outbound mails and reject the email if the sender and the value of this header don't match. It's also possible for a sender to have more than one valid X-Something value. Something like this: * senderdomain1.example is only valid with 'v1', 'v66', 'v99' X-Something header values * senderdomain2.example is only valid with 'v5' * senderdomain3.example is only valid with 'v11' and 'v546' etc, etc Is this possible with postfix? Thanks, -JS
