Running your own SMTP is still going to be tough. But you can use a mail provider that lets you use your own domain, then you can use their SMTP which should not get flagged as easily.

Tesla has sold 7 million and something cars in total according to google. If each of those was 100k, that would still be less than a trillion in total. How could one guy get paid more than the whole company ever made?

Fair point. But I can also see why people don’t want to call it by the name the current owner wants you to use.