The Sun Java System Messaging Server (formerly Sun ONE Messaging Server) is a high-performance, highly secure messaging platform one of the leaders in the service provider messaging market. Scaling from thousands to millions of users, the Java System Messaging Server is suitable for both service providers and enterprises interested in consolidating email servers and reducing total cost of ownership of communications infrastructure.

The Sun Messaging server also provides extensive security features that help ensure the integrity of communications through user authentication, session encryption, and the appropriate content filtering to help prevent spam and viruses.

The Sun Java System Messaging Server along with the Sun Java System Calendar Server and Sun Java System Instant Messaging offer their users a comprehensive communications and collaboration environment. The Sun Java System Messaging Server is also a key component of the Sun Infrastructure Solution for Enterprise Messaging Consolidation, enabling customers to offer rich collaborative services while dramatically reducing costs.

Key Features
* High performance and scalability
* Extensive security features
* Virtual domain hosting and delegated administration
* Scalable, robust and extensible messaging components
* Multiple client support

It has been ported to Unix, Linux & Windows Operating systems.

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