Sun Java System Messaging Server 6.3 Administration Guide

24.1 What is S/MIME?

Secure/Multipurpose Internet Mail Extensions (S/MIME) provides a consistent way for email users to send and receive secure MIME data, using digital signatures for authentication, message integrity and non-repudiation and encryption for privacy and data security. S/MIME version 3.1 (RFC 3851) is supported.

Several email clients support the S/MIME specification, including Microsoft Outlook Express and Mozilla mail.

You can deploy a secure mail solution by using Messaging Server and S/MIME. Communications Express webmail users who are set up to use S/MIME can exchange signed or encrypted messages with other users of Communications Express, Microsoft Outlook Express, and Mozilla mail systems. A messaging proxy can provide an additional layer of security at the firewall to further protect information assets within Messaging Server

The Communications Express webmail client supports S/MIME with these features:

The remainder of this chapter describes how to configure Messaging Server and Communications Express for S/MIME. Note that you do not have to exclusively use Communications Express to be able to use S/MIME with Messaging Server.

24.1.1 Concepts You Need to Know

To properly administer S/MIME, you need to be familiar with the following concepts: