A message that is encrypted by Office 365 Message Encryption is delivered to a recipient’s inbox just like any other email message, but it contains an HTML file attachment.

The encrypted message is in the attachment. The email includes instructions for viewing the encrypted message.

  1. Open Outlook or Outlook Web App.
  2. Compose a new message. 
  3. Enter an external recipient. 
  4. The word “encrypt” MUST be included somewhere in the Subject field.