Encrypt emails with S/MIME or Microsoft 365 Message Encryption …
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 …
Learn about encrypted messages in Outlook.com
Learn about Outlook.com encrypted messages. Discover how to encrypt an email in Outlook, send an encrypted email, and read an encrypted email.
Encryption in Outlook - Microsoft Support
Outlook provides various encryption options to help keep your messages secure. To learn more about encryption in Outlook, select a link under the version of Outlook you're using. What …
Learn about protected messages in Microsoft 365
As part of our message protection efforts, Microsoft has evolved our email encryption solutions to provide a unified sender experience whether you're sending a protected message inside of …
View and reply to encrypted messages in Outlook for Windows
Send encrypted email messages in Outlook. Secure messages by using a digital signature. Get a digital ID. Find digital ID or digital ID services. Send a digitally signed or encrypted message …
Send a digitally signed or encrypted message for Mac
Outlook can encrypt messages with any of the following algorithms: AES-256, AES-192, AES-128, and 3DES. Of these four algorithms, 3DES is the most compatible with other S/MIME …
Encrypt messages by using S/MIME in Outlook on the web
Want to add a padlock to your email messages? You can use S/MIME in Outlook on the web to increase the security of messages. A digitally encrypted message can only be opened by …
Secure messages by using a digital signature in Outlook
A digital signature attached to an email message offers another layer of security by providing assurance to the recipient that you—not an imposter—signed the contents of the email …
How do I open a protected message? - Microsoft Support
Learn how to open an encrypted email in Outlook, Outlook on the web, or read a protected message with a single-use code.
Troubleshoot Office 365 message encryption - Microsoft Support
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 below for troubleshooting instructions.