I used to run ops for a mailing list with over 1 million subscribers (all double-opt-in — perhaps you should google that?). We never had to bother avoiding any

I used to run ops for a mailing list with over 1 million subscribers (all double-opt-in — perhaps you should google that?). We never had to bother avoiding any of the measures you deliberately subvert, because our mail was all legitimate. Granted, doing a 'mail run' with that volume took about a week, but whatever. If your (client's) recipients aren't all double-opt in, then what you're running could very easily be seen as irresponsible (and that's me being polite), no matter how much money it's making.