Canary Mail - Privacy-aware email app for Mac & iOS
Polymail - Native email app for email productivity.
HEY - Email at its best, new from Basecamp.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
ProtonMail - Secure email with absolutely no compromises. Get your free encrypted email account today.
Nylas Mail - The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.