The Multi-protocol Message System (MMS) is an AFTN and AMHS store-and-forward message switching system that maximizes the advantages of modern network techniques.

The MMS includes both the AFTN system and the remote AFTN intelligent terminals. The AFTN switch uses Intel-based servers and the AFTN/AMHS terminals use personal computers.

The MMS optionally includes an AFTN/AMHS gateway and an ATN router.