You'll only see those certificates that you've added to the keychain for your Mac OSX user account and those certificates that are valid for digital signing or encryption.

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You'll only see those certificates that you've added to the keychain for your Mac OSX user account and those certificates that are valid for digital signing or encryption.

Your digital signature, which includes your certificate and public key, originates from your digital ID. And that digital ID serves as your unique digital mark and signals the recipient that the content hasn't been altered in transit.

We are working on an update to the Mac and iOS applications to support signing in by using an alternative user identifier. To resolve this issue, update to the latest version of Mac and iOS apps.

When you receive a message containing a digital signature, you can trust that the sender is who they say they are. If you want to insert a digital signature into an email, you need to install a digital ID (certificate), which is verified by a third party.

A digital signature is an electronic, encrypted, stamp of authentication on digital information such as email messages, macros, or electronic documents. A signature confirms that the information originated from the signer and has not been altered.

A digital signature is used to authenticate digital information — such as form templates, forms, e-mail messages, and documents — by using computer cryptography. Once a form is signed, either the entire form or part of the form that was signed cannot be altered without invalidating the signature.

The Signature Details dialog box displays certificate information such as the signer’s name in the Signing as box, and who issued the certificate. Open the file that contains the certificate you want to view.

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.