Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public key used to encrypt the message can decipher the message for reading.

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If you want to encrypt a message that doesn't meet a pre-defined rule or your admin hasn't set up any rules, you can apply a variety of different encryption rules before you send the message. To send an encrypted message from Outlook 2016, select Options > Permissions, then select the protection option you need.