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Send encrypted email messages in Outlook for Windows
Encryption in Outlook - Microsoft Support
Learn about encrypted messages in Outlook.com
View and reply to encrypted messages in Outlook for Windows
Encrypt messages by using S/MIME in Outlook on the web
Learn about protected messages in Microsoft 365
Encrypt messages by using S/MIME in Outlook Web App
Secure messages by using a digital signature in Outlook
Send a digitally signed or encrypted message for Mac
Get a digital ID in Outlook for Windows - Microsoft Support