Teach the milter what internal mail means

Plenty of mail rules only make sense for one direction of traffic, a disclaimer belongs on outgoing mail, not on messages two colleagues exchange internally. To make that distinction, MSH Postfix Milter needs to know which domains actually belong to your organization.

That is exactly what the Domains panel is for. Once your domains are listed there, the application classifies every message as incoming, outgoing or internal by comparing sender and recipient addresses against that list.

One setting, used everywhere

That classification then becomes available as the Message direction condition, so any rule can target incoming, outgoing or internal mail specifically. There is one detail worth remembering: if a message has both internal and external recipients, it is treated as outgoing, so a rule limited to internal mail will not touch it.

To learn more visit MSH Postfix Milter website.