A digital signature and an email signature are not the same. An email signature is a custom closing salutation you can include in outgoing emails. A digital signature, on the other hand, verifies the sender of an email to the recipient and confirms the message's integrity. A digital signature can only come from its owner.
Digitally Sign an Individual Message:
- Open a new message. On the Options tab, in the More Options group, click the Digitally Sign Message button.
NOTE: If you don't see this button, click the arrow (at the bottom right corner of the More Options group to open the Properties window. Click the Security Settings button and in the Security Properties window, select Add digital signature to this message. Click OK and then close the Properties window.
- Compose your message and send it.
Digitally Sign all Messages:
- In the File tab, click Options. Select Trust Center from the left and click Trust Center Settings (In Outlook 2007, select Tools from the Menu Bar and choose Trust Center to open the Trust Center dialog box.)
- At the left, click E-mail Security.
- In the right pane under Encrypted e-mail, select the Add digital signature to outgoing messages check box.
- To change additional settings, such as choosing a specific certificate to use, click Settings. Click OK.
- Click OK to close the Trust Center.