Help them out by scheduling the email to be sent during business hours?
I suppose it depends on your team dynamics, size, structure, etc. I work with a small, tight knit team and if I already knew someone was going to act a little neurotic with regards to a low priority weekend email, I would do the extra few clicks to make their life slightly better. In a large corporate setting maybe I would be less sympathetic, who knows.
I just don't understand America. And, since this law was apparently necessary in Australia, not that either. They're both just weird.
The behaviour of concern relates to the kind of bosses | managers that make a point of contacting employees out of hours and pressuring them to attend the office | answer questions at length, etc.
It's the direct phone calls and obsessive DM's @ 2 minute intervals that being targetted - most people handle auto generated work related emails well enough, they learn to disable notifications and have muscle memory for "Dismiss".
I was the weird one for not having Slack on my phone. So far I haven't been fired for it. But maybe I haven't been promoted either.