Learn about securing and protecting email messages in Outlook
Learn how to use encryption and other security settings to protect messages sent from Outlook.
Send S/MIME or Microsoft Purview encrypted emails in Outlook
Send S/MIME or Microsoft Purview encrypted emails in Outlook using a work or school account with a qualified Microsoft 365 subscription.
Send encrypted messages with a Microsoft 365 personal or family ...
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 …
Open encrypted and protected messages - Microsoft Support
Learn how to identify and open encrypted and protected emails no matter what email client you're using.
Set up Outlook to use S/MIME encryption - Microsoft Support
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 …
Classic Outlook recipients are unable to open "Encrypt Only" emails
Jan 6, 2026 · After updating to Current Channel Version 2511 (Build 19426.20218) recipients may not be able to open “Encrypt Only” emails. In the Reading Pane you may get a message "This …
Send a digitally signed or encrypted message for Mac
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.
Why can't I encrypt? - Microsoft Support
Once you exchange signed mail and install the certificate, you will be able to send encrypted emails. If you can't encrypt, you are missing the recipient's public key.
How do I turn on S/MIME in Outlook Mobile - Microsoft Support
To turn S/MIME on: In Outlook, tap the Account control at the top left, then select the Settings button near the bottom left. Tap on the specific account you want to turn S/MIME on for. Tap …
Secure messages with a digital ID in Outlook - Microsoft Support
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 …