As any salesperson, PR rep, or entrepreneur can tell you, the rate at which people open and respond to your emails can be the difference between accelerating your career and the pit of despair. 

No wonder we all spend so much time obsessing about subject lines, exact phrasings, and crafting the perfect ask. But according to research from email software company Boomerang, there’s one part of your messages you’re probably not putting enough thought into — your closing.