Evomail+ is now available for iPhone and boasts a simpler, more fluid experience than its predecessor, most of which was based on collected user feedback. The new One Button feature of Evomail+ constantly adapts and changes to better suit what you're doing at that exact moment. Which is why I'm replacing the default Mail app on my iPhone with Evomail+, at least for now.
I just recently did a review of Evomail and came away extremely impressed with what it brought to the table when it comes to alternative mail clients. It's now been updated with even more great features including Dropbox and Box support for attachments. Other new additions include the ability to upload custom avatars for each account, a much more robust in-app settings panel, and more.
Evomail is an alternative email app for iPhone and iPad that takes a lot of the same features we love from Mailbox, Dispatch, and more but adds certain highly wanted features that a lot of others unfortunately lack, such as folder support. Evomail currently supports Gmail, iCloud, and Yahoo! accounts which makes it a pretty relevant option for almost everyone.