16. Schedule emails to send in the future
Many people have described Boomerang as the missing link of Gmail. This handy app lets you schedule email sends for the future, so you can work now and have your messages send when you’re long gone lounging poolside. It’ll also track who’s opening your mail, and remind you if you haven’t received a reply on something crucial.
17. Send form responses faster
If you’re constantly sending the same copy + paste emails at the office, try creating “Canned Responses.” You can enable them in Settings, in the “Labs” tab. Then in the compose window, select the "More options" arrow at the bottom to choose your pre-entered response, making it all the much faster to tell your boss “I’m right on top of that!” Time you can use to catch up on House of Cards at your desk.
18. Get a Google map image with every address someone sends
In the Labs section, enabling “Google Maps previews in mail” will show you a map every time someone sends an email with an address in it, giving you an easy reference point. There are lots of other external services (Yelp, etc) that you can opt to preview in Labs as well.