No matter how many times I try to find a “better” email app, I always go back to the simple but easy to use default Mail app on my iPhone. It’s the right email app for me.
I’ve tried Mailbox, Outlook, Newton, Spark, and a few others that I already forgot. They all felt wrong.
The killer feature for me that the Mail app has that other don’t have is allowing me to move a mail message to a folder on a different account. I’m not sure if I just don’t know how to do it on the other apps but on Mail it just allows you to do it right away.