Machine opens kept apart, and send-time optimisation that proves itself

Apple Mail Privacy Protection and email image proxies open every message on delivery. Those are now shown as machine opens and never counted as opens, so your open rate, "opened" flows, non-opener follow-ups and send-time optimisation only hear from people. Send-time optimisation learns from opens and clicks, stays out of quiet hours, and is on by default only once an experiment in your workspace shows it helps.