Newton Mail - Email App for Gmail, Outlook, IMAP – 9.2.13

Newton is a subscription-based service that supercharges your email with power features like Read Receipts, Snooze, Send Later, Undo Send, Sender Profile, Connected Apps and more across Android Phone, Tablet and Wear. Newton is available as an in-app subscription for $49. 99/yr. That's about $4/mo for something that you use dozens of times every day.