A while ago I got this one and I thought it was beyond perfection: “I check email once per day, for no more than one hour per day. If your message requires an urgent response please mark it as such. If I have not responded to your email within a week, please send it again.”

Unfortunately, I ended up with: - people obsessively writing URGENT in emails that were not urgent, causing me too much anxiety when opening my inbox - mean responses about why did I think I was so important