At work we often have to communicate with someone at the end of the day, and sometimes we do it deliberately. I try to structure my work so that by 5 or 6 p.m. only a minimum of important tasks remains, and all of them are already moved to the next morning.
Hardly anyone would think of starting work communication right before going to sleep, at the very end of the day, would they? The end of a workday should be treated the same way.
In Kabbalah and Hasidism, a new day begins in the evening.
“I’ll finish it and write before I leave” is a very bad idea.
The assumption is that the feedback will simply be “OK.” But what if it isn’t? What if additional questions come up? Then the reply catches you on the road, at home, or in a cafe over dinner. And what if answering it requires collecting more information, which means pulling even more people into the conversation? At that point you are no longer happy that you started the exchange at all.
If you send someone a message, stay available for at least another 10 minutes so you can react to the reply.
That applies to meetings, lunch, and everything similar.