[nomagicbullet]

They could be giving you a subtle hint to not send messages outside of work hours.

[coldpie]

I don't know their working hours, we've got staff all over the globe and people work whatever hours they like. I have no expectation for anyone to check work communications outside of their working hours, and it's bonkers to me that people think anyone would have that expectation.

[prmoustache]

That's weird. When I am off, I don't read those messages anyway. Who would be checking at their messages AND be annoyed at receiving them?