I started using Email, and like it a good bit.
https://itunes.apple.com/us/app/email-mail-for-gmail-yahoo/id922793622?mt=8&at=10l3Vy
Still considering the switch to all iCloud for email, but for the moment I'm really liking that app.
I've been thinking about giving that app a try. How is it in comparison to the Outlook app? I really like the Outlook app, but as always, I've returned to using the native Mail app.