EasilyDoMail.com
Much of the time I'll do this on my phone. And over the last eight years or so, that's meant using Apple's built-in Mail app for the iPhone. It's not the best, but it's awfully convenient.
Over the years I've tried countless alternatives in an attempt to dethrone Apple's default email app. Some of them were excellent - Acompli, which Microsoft bought and turned into Outlook, was one standout - but I always ended up returning to Apple's default for one reason or another.
But now I think I've finally found the right email app for me. For the last two weeks, I've been using an app called EasilyDo Email. It has everything I want in an email app, plus some cool features I wouldn't have even thought I wanted. More importantly, I've found this iPhone app to be simpler, faster, and better at email management than Apple's Mail app. Check it out.