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

If you choose the Encrypt option, recipients with Outlook.com and Microsoft 365 accounts can download attachments without encryption from Outlook.com, the Outlook mobile app, or new …

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

You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages.

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

In an email message, choose Options, select Encrypt and choose the encryption option that has the restrictions you'd like to enforce, such as Do Not Forward or Encrypt-Only.

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.

Create email encryption or decryption rules in the Exchange admin center using a keyboard and screen reader.

Troubleshoot Office 365 message encryption Have you received an encrypted message you can't open? Are you unable to add permissions to a message you want to send? Select your issue …

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 …