The app sports a number of popular features, including read later and mailbox organization. However, the system also creates read receipts and allows you to send emoticon replies to messages.
The app has been updated to support nine languages and Watch OS. They have also updated the UX. The team timed the launch to coincide with the imminent death of Mailbox, the popular “snoozing” email app.
A Mac version is forthcoming. You can download the new app here.