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MVP Award Program. Encrypted messages can be read only by intended recipients who have a certificate. If at least one recipient of an encrypted message has a certificate, Outlook on the web will send the message to all recipients. If none of the intended recipients has a certificate, Outlook on the web won't let you send the message in encrypted form. A digitally signed message reassures the recipient that the message hasn't been tampered with and verifies the identity of the sender.

Digitally signed messages can be sent to anyone. You're using the new Outlook on the web. You're using classic Outlook on the web.

Select Automatically choose the best certificate for digital signing. How do I verify the signature of a digitally signed message? Need more help? Expand your skills. Get new features first. Was this information helpful? Yes No. Thank you! Any more feedback? The more you tell us the more we can help. Can you help us improve? Resolved my issue. Clear instructions. This information is used by Outlook on the web when validating the signature of an email and ensuring that it was signed by a trusted certificate.

A variety of encryption technologies work together to provide protection for messages at rest and in transit. Transport Layer Security TLS : Encrypts the tunnel or the route between email servers in order to help prevent snooping and eavesdropping, and encrypts the connection between email clients and servers.

BitLocker : Encrypts the data on a hard drive in a datacenter so that if someone gets unauthorized access, they can't read it. Skip to main content. This browser is no longer supported.