Polymail - Native email app for email productivity.
Airmail for iOS - One of the best Mac email clients, now on iPhone
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
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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
Maily McMailFace - Dead-simple, people-centric 👩💼👨💼 mail app 💌