How you can have an article talking about the history of email and it not be about Ray Tomlinson, I just don’t know. Wait - now I know: This person looked up the Wikipedia article on the smtp protocol and decided Mr. Postal was the pioneer of email.
The conclusion is completely incorrect, also. About the only correct thing was that reputation is important for email transmission.
No: you can’t just set up an smtp outbound server on your home server and expect the world to trust you. For good reason: we’ve had decades of trojans and viruses taking over home PCs and sending spam. Your ISP declares its “home” IP ranges, and those are immediately not trusted.
That doesn’t mean you need to use a big email hosting provider. If you set up on a business IP range, configure your DNS Correctly with declared mx and spf records, the world will trust you (until you demonstrate that it can’t).