Changing your email signature on Apple Mail for Mac
Apple Mail provides an easy way to create and change signatures directly within the preferences of the app itself. Just follow the simple steps outlined below and you will be all set.
In Apple Mail, open Preferences
Click on 'Signatures'
Click on the Plus-Symbol to create a new signature
Uncheck the 'Always match my default message font'
In the new email window, select your signature
Done 🎉 — now every new email you send will contain your signature!