Everyday we will get number of mails to our inbox but in that 90 percent of emails or useless and we get only 10 percent of useful mails. we can't open everymail to make it as read mail and it is time waste work. We can mark all unread emails as read mail without opening it even using in mobile app also. Go through above video to know about how we can mark email as read or unread mail in gmail app.