Yeah. Not to mention a lot of SMTP pain is when a major provider decides to blackhole you, or you are spam blacklisted, neither of which is under your control.

Yeah. Not to mention a lot of SMTP pain is when a major provider decides to blackhole you, or you are spam blacklisted, neither of which is under your control. Even a large corporation that self-hosts mail may have to constantly call other companies to get on their good side so they can send mail again. (The bigger you are, the more often this happens, but it also happens to small timers)