Are you sure that "complicated" and "secret" don't just mean "I don't know how it works" and "I haven't bothered reading the documentation"? There really isn't

Are you sure that "complicated" and "secret" don't just mean "I don't know how it works" and "I haven't bothered reading the documentation"? There really isn't much secret about it, and I do indeed send all my emails using a mail server running on my home router. Just because you haven't bothered to learn about something, doesn't mean it's somehow secret or unreasonably complicated.