Who are the organisations keeping these lists of 'inactive' accounts and doing it in such a sloppy way that receiving text mail counts as not existing? I sure a

Who are the organisations keeping these lists of 'inactive' accounts and doing it in such a sloppy way that receiving text mail counts as not existing? I sure as hell haven't told them whether or not I use any of my email addresses. Isn't the solution to correct them, not to go along with them? Surely Mozilla has enough clout to at least get a message to them rather than just throwing in the towel?