Canary Mail allows you to include a custom signature with each outgoing message. 1) Download and configure Canary Mail on your Windows Device. 2) After setting up an account, Click Preferences. 3) Click the Signature tab. 4) Enter a signature to be used for your emails. HTML is also supported in Canary Mail for Windows, thus you can click the HTML button at the top of the signature editor and modify the markup directly. In this way, you can add signatures to Canary Mail and use them later in your emails.