On Thu, Nov 04, 2021 at 10:51:06PM +0100, Gionatan Danti wrote: > I was tasked to mark all messages coming from unauthenticated clients > (ie: incoming emails) with a specific subject line.
Best practice when requirements get complicated is to divide and
conquer. Use a separate dedicated machine (or dedicated public
IP address) for inbound mail with a separate Postfix instance
handling only inbound mail.
Outbound email is then handled by a separate machine or Postfix
instance.
--
Viktor.
