Troops creates Slackbots for sales teams.
I'll quickly look over my email. If there's nothing urgent, I try to do something that is not reactive, that's more of a project-based piece of work that takes dedicated time. Generally, it's trying to get the most important thing done, which is not typically email.
For me, it's very easy once I get in email-reaction mode to be doing that all day and not doing any high-level work. So I try to avoid that as long as possible and try to knock out whatever the most important thing is.