As a feature-rich desktop email client, Microsoft Outlook has the option to manage digital signatures. Unlike a regular message signature, a digital signature is a security feature and is therefore managed through the Microsoft Outlook Trust Center -- which controls privacy and security settings for Outlook. Disabling a digital signature through the Trust Center will automatically disable the signature on all outgoing messages. However, you can also turn off the signature for a single message through the Options tab on a new Message window.

Use the Trust Center

Step 1

Open the "File" menu, then select "Options" to launch the Outlook Options dialog window.

Step 2

Select "Trust Center," then "Trust Center Settings" in the Microsoft Outlook Trust Center section.

Step 3

Select "Email Security," then clear the "Add Digital Signature to Outgoing Messages" check box in the Encrypted Email section.

Step 4

Click "OK," then "OK" again to save your changes.

Disable Signature on Individual Messages

Step 1

Open a new Message window, then select the "Options" tab.

Step 2

Select the "Options Dialog Box Launcher" icon (resembling an arrow exiting a box) in the More Options group.

Step 3

Click "Security Settings" in the Security section, then clear the "Add Digital Signature to This Message" check box. Click the "OK" button to save the change.

Step 4

Click the "Close" button to close the Message Options window.