You can send an encrypted message to anyone for whom you have the public key—in other words, you have that recipient’s certificate as part of his or her contact information. You can encrypt single messages or specify that all messages be encrypted (when possible).

To encrypt a single message:

1. Create the new message.
2. Click the arrow in the Options section of the Message ribbon to display the Message Options dialog box.
3. Click the Security Settings button to open the Security Properties dialog box (Figure 28-21).
4. Select the Encrypt Message Contents and Attachments option.
5. Click OK; then, click Close to return to the message.
6. Compose and send the message as usual.

FIGURE 28-21
The Security Properties dialog box.

Of course, messages can be encrypted only when they are going to one or more recipients for whom you have a certificate. If you request encryption for a message going to people for whom you do not have a certificate, Outlook displays a message and gives you the option of sending the message without encryption.

You can also tell Outlook to encrypt all outgoing messages and attachments. Of course, this capability affects only messages that you send to people whose public key you have. To tell Outlook to encrypt all outgoing messages and attachments, follow these steps:

1. Choose Trust Center from the Tools menu to open the Trust Center window.
2. Select E-Mail Security from the list on the left.
3. Select the Encrypt Contents and Attachments for Outgoing Messages option.

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