If you want to have a fast and highly efficient email client with a number of helpful features like scheduling, batch archiving and pinning, I suggest you go with Spark Mail ( free). If you don’t want to go through this rigamarole, you will be better off using a third-party email client for Mac, to take control of your emails. Now, make the necessary changes in the New Mail Message box. After that, find the application and click on Open. To do so, launch Automator -> open the existing document. Do note that the app may ask for your confirmation for the first time it runs.
That’s pretty much it! The scheduled email will be sent at the stipulated date and time.
