Microsoft Exchange Server gives you several options for keeping your email message data secure. The options fall into two categories: transport encryption, which protects the connection between two machines and thus protects the contents of the message over that conversation; and message encryption, which protects the message itself independent of the connections it travels over, ensuring that only the recipient can read it.
Transport Encryption
Transport encryption, also known as session encryption, protects the protocol over which the message data is transmitted. The three main kinds of transport encryption are: Encrypted Messaging API (MAPI), Secure Sockets Layer (SSL) or Transport Layer Security (TLS), and IPsec.
If you want to secure sessions between Microsoft Outlook and Exchange, enable encryption of the MAPI protocol. MAPI uses remote procedure call (RPC) between the client and server. By default, the RPC streams are unencrypted, but you can enable 128-bit RPC encryption in the Outlook user profile. Be aware that this setting provides a relatively weak level of encryption and only protects the MAPI traffic between Exchange and Outlook. It does nothing to protect email messages that go beyond the sender's mailbox server. . . .
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