I'm not exactly sure what argument you are making. Yes, ESPs often drop most self-hosted email because that's easy and economical (if, perhaps, dickish). No,

I'm not exactly sure what argument you are making. Yes, ESPs often drop most self-hosted email because that's easy and economical (if, perhaps, dickish). No, if you're an international ESP (like mine) there is no real 'domestic IP' you can block against.