You can theoretically send email to an IP address directly, like someone@[127.0.0.1], but I imagine a lot of the programs and websites you'd want to use don't k

You can theoretically send email to an IP address directly, like someone@[127.0.0.1], but I imagine a lot of the programs and websites you'd want to use don't know that. And you're still left with the problem of needing to get that IP address from someone who can arbitrarily take it away from you.