> E-mail is, at its core, best-effort, [...] If anyone expends as much effort at delivery (7 days, usually, with spaced repetition) of anything these days, I'd

> E-mail is, at its core, best-effort, [...] If anyone expends as much effort at delivery (7 days, usually, with spaced repetition) of anything these days, I'd be seriously impressed. > Implementing "quiet hours as seen in IM", means using the wrong tool. Modern MUAs can usually do this sort of thing, tbf. AFAICT using the MTA is a great way to avoid "can't stop looking syndrome"... I can't see the content of e-mails if all I see is 'rejected email from xyz@foo.bar' in the logs. Ofc, you need to reject them before they enter the queue -- that's the point! Anyway, I don't particularly begrudge anybody solving problems in a way that works for them.