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 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.

Whether it’s a new job title (congratulations!) or a phone number change, make sure you keep your email message signature up-to-date. If you're using new Outlook, for more information about email signatures, or if you haven’t created one yet, see Add a signature to messages.

Compose your message and then send it. Select Add a digital signature to all messages I send. If this option isn't available, it means your admin manages this setting on your behalf. Note: The settings in new Outlook and Outlook on the web are synchronized.

To check whether the signature is valid, select the ribbon on the Signed By status line. Then, to see more information about the digital signature, select Details.

One solution for protecting message content is Secure/Multipurpose Internet Mail Extension (S/MIME). Mobile messaging applications like Outlook for iOS and Android work in conjunction with S/MIME to sign and encrypt Microsoft 365 message data.

You can add links and images to your email signature, change fonts and colors, and justify the text using the mini formatting bar under Edit signature. You can also add social media icons and links in your signature or customize one of our pre-designed temlates.

Create custom signatures that can be automatically added to your email messages. Email signatures can include text, images, your electronic business card, a logo, or even your handwritten 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.

When you sign a signature line, you add a visible representation of your signature and a digital signature. In the file, right-click the signature line and choose Sign.