I think this creates a very undesirable culture where working outside of hours becomes normalised / expected / pressured. You can say it all you want that peopl

I think this creates a very undesirable culture where working outside of hours becomes normalised / expected / pressured. You can say it all you want that people don't have to read it or reply but some will still perceive that they need to read or respond to the messages even if it is just so they are "in the know" or not left out of discussions that might occur out of hours. I delay all messages I send (even emails) so they appear in business hours. Slack and Outlook both support this and I suspect other tools too. The only real downside is that sometimes things evolve and then you have an incorrect or out of context / misleading message popping up ("It seems like the production database is down" popping up 8 hours after it was resolved etc).