> As I read it, 'smtp_header_checks' provides a way to do header > checks only on messages that are leaving the system, leaving local > delivery unaffected?
The SMTP client cannot add or remove recipients. The decision to
forward mail needs to be made before the queue manager.
Therefore, milter_header_checks is more practical.
spammer -> smtpd -> cleanup -> qmgr -> smtp -> yahoo etc.
milter adding -> local -> mailbox
spam header;
milter_header_checks
adding yahoo etc.
address.
Wietse
