Send encrypted email messages in Outlook for Windows
In an email message, choose Options, and then select Encrypt. Pick the encryption that has the restrictions you want to enforce, such as Encrypt-Only or Do Not Forward . Finish composing your email and then choose Send .
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.
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 applications, and AES-256 is the most secure. Encrypt outgoing messages. Select this option if you want to encrypt all outgoing messages by default.
View and reply to encrypted messages in Outlook for Windows
Messages that have the encrypt-only policy applied can be read directly in new Outlook, Outlook on the web, in Outlook for iOS and Android, Outlook for Windows versions 2019 and newer, and Microsoft 365. If you're using another mail service, you'll see a message with a link.
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 your organization or outside your organization. How do encrypted messages work?
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 version of Outlook do I have? Outlook for Windows. Encrypt email messages
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 message. Your digital signature, which includes your certificate and …
Get a digital ID in Outlook for Windows - Microsoft Support
A digital ID—also known as a digital certificate—helps prove your identity and helps prevent message tampering to protect the authenticity of an email message. You also can encrypt messages for greater privacy.
Premium features in Outlook.com for Microsoft 365 subscribers
Outlook.com includes encryption and prevent forwarding features that ensure your confidential and personal information you share via email stays encrypted and doesn’t leave Microsoft 365. This is useful when you don’t trust the recipient’s email provider to be secure.
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 recipients who have the correct key. A digital signature assures recipients that the message hasn’t been tampered with.
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