I have been using this application for two weeks.
I like this application to have three missing features which we see in most of Email apps nowadays.
1. Notifications for new email, I am using this app in ios 9. There is no option for enabling the notification.
2. Adding new folders in order to separate different emails in different categories for easier tracking purposes.
3. Editing forwarded messages and to be able to delete forwarded message content for security purposes.
I hope to see these improvements as soon as possible.