How Outlook client-side signatures work

Use client-side signatures when you want users to see and insert signatures while they compose messages in Outlook. This mode is enabled when you choose Client-side or Both in the setup wizard.

When client-side signatures are enabled, Signature 365 inserts the signature into newly composed messages in supported Outlook clients.

• For Microsoft 365 subscription clients, deploy the Outlook add-in.
• For perpetual Outlook desktop versions, deploy the Outlook (Classic) agent.

If you are deciding between client-side and server-side delivery, compare the two approaches in What is the difference between client-side and server-side signatures?. For the server-side routing model, see How Microsoft 365 server-side signatures work.

Next steps

• How to install the Outlook add-in
• How to install the Outlook (Classic) agent
• Applying signatures to users and groups