This article explains how to insert a text or image link into your email signature in macOS or OS X Mail. Instructions apply to Mail in macOS Catalina through OS X Lion.
Understanding Mac Mail Signatures
Mail makes it easy to insert links into your email signature, so your message recipients can easily visit your website or follow another link.
Open the Mail application. Select Mail > Preferences.
Click the Signatures tab at the top of the Email Preferences screen.
