The Defense Message System or Defense Messaging System (DMS) is a deployment of secure electronic mail and
directory services in the United States Department of Defense.
DMS was intended to replace the AUTODIN network, and is based on implementations of the OSI X.400 mail, X.500 directory and X.509 public key certificates, with several extensions to meet the specific needs of military messaging. DMS has been coordinated
by the Defense Information Systems Agency (DISA), and testing began in 1995.
Amongst other vendors, Microsoft and IBM sell versions of their electronic mail software
(Outlook/Exchange and Notes) that have been tested for compliance with DMS requirements.
See Also