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

This is useful when you don't trust the recipient's email provider to be secure. To see encryption options, compose a new message, select the Options ribbon, and then select Encrypt.

Depending on what kind of security is needed, someone sending an email from Outlook can encrypt the message, add a digital signature, apply a sensitivity label, or protect the way an …

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 …

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.

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 …

You can also use S/MIME encryption (Secure/Multipurpose internet Mail Extensions), a widely accepted protocol for sending digitally signed and encrypted messages. To use S/MIME …

Information Rights Management (IRM) allows you to specify access permissions to email messages. IRM helps prevent sensitive information from being read, printed, forwarded, or …

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 …