Official Gmail Blog: Computer, respond to this email: Introducing Smart Reply in Inbox by Gmail

Email + machine learning

"Smart Reply suggests up to three responses based on the emails you get. For those emails that only need a quick response, it can take care of the thinking and save precious time spent typing. And for those emails that require a bit more thought, it gives you a jump start so you can respond right away.

There's actually a lot going on behind the scenes to make Smart Reply work. Inbox uses machine learning to recognize emails that need responses and to generate the natural language responses on the fly. If you're interested in how Smart Reply works, including how researchers got machine learning to work on a data set that they never saw, you can read more about it on the Google Research Blog."

Official Gmail Blog: Computer, respond to this email: Introducing Smart Reply in Inbox by Gmail