Send S/MIME or Microsoft Purview encrypted emails in Outlook using a work or school account with a qualified Microsoft 365 subscription.

Learn how to use encryption and other security settings to protect messages sent from Outlook.

If you have a Microsoft 365 Family or Microsoft 365 Personal subscription, Outlook includes encryption features that let you share your confidential and personal information while ensuring that your email …

Before you can send and receive messages with encryption or digital signatures, or digital IDs, please follow the instructions to set up encryption in Outlook. Note: To use encryption, your account must …

Learn how to identify and open encrypted and protected emails no matter what email client you're using.

To send and receive encrypted email messages, both the sender and the receiver must share their digital ID certificates with each other. Open a message that is digitally signed as indicated in the …

Feb 24, 2026 · To prevent the issue, select the Options ribbon, then select Encrypt, and choose Encrypt or Do Not Forward as noted in this article, Send encrypted messages with a Microsoft 365 personal …

Learn how to use digital signatures and encryption in Outlook for Mac. Both the sender and recipient must have a mail application that supports the S/MIME standard.

You can restrict permission to content in email messages in Outlook with Information Rights Management (IRM), just as you can restrict permission to other Microsoft Office files.

To restrict the actions that recipients can take on the messages you send, we recommend that you use Office 365 Message Encryption or Information Rights Management (IRM) if they're available in your …