Encrypt One Message
Encrypting an email message in Outlook converts the message from readable, plain text into scrambled cipher text. The recipient of the message has a private key that matches the public key used to encrypt the message. This private key deciphers the text of the message. Any recipient without the corresponding private key, however, sees indecipherable text.
- In an email message, choose Options.
- Select Encrypt and pick the encryption that has the restrictions you would like to enforce.
Encrypt All Messages
When you encrypt all outgoing messages by default, you can send messages the same as with any other messages, but all recipients must have your digital key to view your messages.
- On the File tab, navigate to the Options section
- Select the Trust Center and then Trust Center Settings.
- On the Email Security tab, under Encrypted email, select the Encrypt contents and attachments for outgoing messages check box.
- To change additional settings, such as choosing a specific certificate to use, click Settings.