One Time Passes For Encrypted Messages

A message encrypted by Office 365 Message Encryption is delivered to a recipient’s inbox like any other email. It contains an HTML file attachment that the recipient can open to view the message on the Office 365 Message Encryption portal. The recipient can choose to sign in with a Microsoft account or a work account associated with Office 365, or use a one-time passcode to view the message.

Read an Encrypted Message Using a One-Time Passcode (OTP)

If you receive an encrypted message, follow the instructions in the email message to decrypt and read it.

1. Download the message.html attachment.
2. Navigate to the location you downloaded the message.html file to and double-click to open it.
   
3. When the message opens, select use a one-time passcode.
   
4. A passcode will be sent to you in an email message. Copy the passcode from the email and paste it (or type it in) and then click continue.
   
5. You should now be able to view the message.

Note: Each passcode expires after 15 minutes. If that happens, or if you can’t open the message for any reason, re-download the attachment and follow the steps above.