Out of the labs and into the frying pan.

Out of the labs and into the frying pan. Unsend has graduated to a core feature in Gmail. If you haven't been using the unsend lab, you've been missing out. While you have to know within the first 30 seconds (max) whether you want to call off that send button, it's a much needed feature when you realize your words might be taken out of context or you notice that misspelled word at the last minute.
http://www.wired.com/2016/04/unsend-emails-gmail-inbox/