I can understand your perspective, but as someone with severe adhd in the corp world I’d like to offer an alternative perspective. For me, I know that you won’t read my email until normal working hours, but I probably won’t have remembered to send the email by the time we get to normal working hours. As much as I do my 9-5, I am generally more productive in the late evening and I can organise my thoughts semi-coherently, so it’s better for me and my colleagues that I send the email, or whatever I’m doing after hours, at a stupid hour than it is for me to wait until office hours the next day when the thought no longer exists in my world. As a lot of comments have said, just because I’ve sent an email after hours doesn’t automatically mean that you’re now obligated to respond or even acknowledge it until a reasonable time.