I own my own domain and rely on the hosting company's servers for sending email. (But I send most email from my @gmail.com address.) I understand the desire to

I own my own domain and rely on the hosting company's servers for sending email. (But I send most email from my @gmail.com address.) I understand the desire to operate your own email servers; but keep in mind that the cat-and-mouse game is going to continue to put the squeeze on you and require more and more of your attention. It's "not a big deal" if you're a large company, or operating email servers is your full-time job. Otherwise, if this is a hobby, the $100 / year to have someone else run your email server is probably a lot cheaper than your time.