Encrypt a single message using S/MIME in classic Outlook. In an email message, select Options > Encrypt. Choose the encryption option that has the restrictions you'd like to enforce, such as Do Not Forward. Finish composing your email and then select Send. Encrypt all outgoing messages using S/MIME in classic Outlook

Learn about Outlook.com encrypted messages. Discover how to encrypt an email in Outlook, send an encrypted email, and read an encrypted email.

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. Send, view, and reply to encrypted messages in Outlook for PC

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 for Mac. Advanced Outlook.com security for Microsoft 365 subscribers. Learn about encrypted messages in Outlook.com. Encrypt messages using S/MIME in ...

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?

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.

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 …

Learn how to open an encrypted email in Outlook, Outlook on the web, or read a protected message with a single-use code.

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.

Want to add a padlock to your email messages? You can use S/MIME in Outlook Web App 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.