Digitally Sign Messages

Overview

Digitally signing an Outlook message provides authenticity, proving the sender is who they claim to be, and integrity, ensuring the message hasn't been tampered with since it was sent. It uses your private key to create a unique signature, and recipients can use your public key to verify the message's origin and content integrity.

Step by Step Guide

How to Digitally Sign a Single Message

In New Outlook

1. In the message, on the Options tab, in More Options, select Digitally sign this message.
   If you don't see the Sign Message button, you might not have a digital ID configured to digitally sign messages, or it not active for you.
2. Compose your message and then send it.

In Classic Outlook

1. In the message, click on the Options tab, and select the Direct Replies To option.
2. Click Security Settings, and then select the Add digital signature to this message check box.
3. Click OK, and then click Close.

How to Digitally Sign all Messages

In New Outlook

Digitally sign all messages in new Outlook

1. Select Settings > Mail > S/MIME​​​​​​​
2. 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.

In Classic Outlook

1. On the File tab, click Options >Trust Center.
2. Under Microsoft Outlook Trust Center, click Trust Center Settings.
3. On the Email Security tab, under Encrypted Mail, select the Add digital signature to outgoing messages check box.
4. Click OK on each open dialog box.

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Additional Information

Need additional information or assistance? Contact the IT Help Desk Chat Line or call the IT Help Desk at 979-830-4357 (HELP).