Supporting Messaging Clients

Require Encryption

This option is available only when a certificate is associated with the POP3 virtual server. To encrypt all information transmitted across the network, you must require that a secure channel be used. When private messages are sent, Exchange ensures that the body of a message is encrypted from the moment it leaves the source until the moment it is read by the recipient.

Tip   Exchange uses 40-bit encryption by default. To strengthen encryption, you can require that the largest key possible be created. Using 128-bit encryption creates a larger key, which is more difficult for unauthorized users to guess.

To require encryption:

  1. Start System Manager
    on the Start menu, point to Programs, point to Microsoft Exchange, and then click System Manager.
  2. Navigate to POP3.

    System Manager

    1. Administrative Groups
    2. Administrative group
    3. Servers
    4. Server
    5. Protocols
    6. POP3
  3. In the console tree, right-click a virtual server, and then click Properties.
  4. On the Access tab, click Communication.
  5. Select Require secure channel.
  6. If 128-bit encryption is supported on the Exchange server hosting the POP3 virtual server, click Require 128 bit encryption.