Encrypt email messages

When you need to protect the privacy of an email message, encrypt it. 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. Any recipient without the corresponding private key, however, sees indecipherable text. Outlook supports two encryption options:

 

Encrypt with Office 365 Message Encryption

In an email message, click the Subject line and type [secure email] into the line before your subject.

Last Updated: 9/30/19