[sokoloff]

To send me a gmail right now, you'd have to hold send for a little over 3 minutes. To send me a work email right now, you'd have to hold it for almost 20 minutes. Works for me! :)

(Of course, you can't know the actual destination mailbox [nor its contents] at the time of sending the email [forwarders, mailing lists, not wanting to leak information, etc]).

[bogeholm]

Well, sounds like a pretty effective back-off multiplier to me :) With recipient-configurable values of course.

Maybe the problem with email is that is it such an old installation, in lack of a better word. I feel like there’s a better - almost similar - format waiting right around the corner.

In particular, sending has to incur some sort of ‘cost’ in terms of time or effort. This [0] needs to be doubly conservative.

[0]: https://en.m.wikipedia.org/wiki/Robustness_principle