After iOS 15 email marketing was changed forever, and email open rates are no longer important, right? Wrong. Since the moment that iOS 15 was a gleam in Tim Cook's eye, self-styled email marketing experts began advising that you could start ignoring open rates because, and we quote, "they are no longer accurate" and "they are artificially inflated by iOS 15." To paraphrase a beloved children's story, this is terrible, horrible, no good, very bad advice.