It seems to be just that! I have found that all my important emails are all in one app & saves me space. It is sad how little space these iPhones come with for the user to utilize. This app saves the day fortunately. ****Update - App use to be very fast, lately have seen "slow connection to mail server" message when retrieving mail periodically. Also the Trash folder is reporting garbage emails, even after I delete them from it. Not sure why that is.
Tazman812 about Email - Edison Mail, v1.4.2