Polymail - Native email app for email productivity.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
Morning Mail - A new way to manage your mail. Tinder for email.
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Canary Mail - Privacy-aware email app for Mac & iOS
Hop - Spike makes working easier and more efficient. Saving you and your team time, sanity, and a lot of headaches.