I maintain inbox 0: Everything gets immediately archived, deleted, or answered. If none of these is possible, it’s moved to the Todo folder. If I don’t have time to handle mails, the inbox grows until I have time again.
One of my main problems with Slack (as opposed to email) is that I can’t seem to find a reasonable way to deal with messages later. The reminder approach doesn’t do it for me at all. How do you handle todos?