Sending personalized, bulk mail via Apple Mail

I've been searching for days and on various forums and pro tips sites and couldn't find a simple (understandable to the layman) way to tackle sending personalized, bulk mail via Apple Mail. So I thought, maybe ChatGPT could help me and voilà! I decided to share the various answers I received because I found similar answers in part elsewhere, but without the detailed and simple explanations. I will be testing them (maybe not all of them). If anyone beats me to it and tweeks these better than what was provided here, PLEASE share for those of us small business owners who want to stay in the Apple ecosystem and still send bulk mail. NOTE: my question likely could be improved upon to have better answers. How great it would be to just have a bulk mail feature in Apple Mail. ;)

[Edited by Moderator]