May 4, 2026 · Compare Microsoft 365 encryption options including Microsoft Purview Message Encryption, S/MIME, Information Rights Management (IRM), and learn about Transport Layer …

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

Set up Outlook to use S/MIME encryption Applies To Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the …

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

Sep 26, 2025 · With Microsoft 365, your content is encrypted at rest and in transit with the strongest encryption, protocols, and technologies available. Get an overview of encryption in Microsoft 365.

Jan 10, 2025 · Learn how to send and receive encrypted email messages between people inside and outside your organization.

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 …

Note: To learn if the certificate is intended for digital signing and encryption, in the Select Certificate dialog box, select View Certificate. An appropriate certificate for cryptographic messaging (such as …

May 4, 2026 · Learn about Microsoft Purview Message Encryption that enables protected email communication with people inside and outside your organization.

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

Send a digitally signed message in Outlook for Mac Before you start this procedure, you must have added a certificate to the keychain on your computer. For information about how to request a digital …