The world's most popular email service, now lets you set an expiration date for your emails, recall them, set pass codes for replies your send and more. Gmail Smart Compose You can write emails much faster when you use Smart compose. It is based on the machine learning. It will predict the upcoming words and shows as suggestion while your comping an email. In the top right corner, click settings and then settings. Under 'General', scroll down to Smart compose. To turn on predictions, click to choose writing suggestions on. To turn off predictions, click to choose writing suggestion off. Use Gmail without internet connectivity If you are unaware, using Gmail offline is also a possibility now. However the actual works will be done only when the device gets internet connectivity. if the offline mode is switched on, you can access gmail, compose emails and save them. this option can found in Settings > Offline Tab.