Mailbird - Mailbird is the best email client for Windows 7, 8 and 10

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

Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.

Mailspring - Mailspring is a mail client for Mac, Windows and Linux.

myMail - myMail is the smart email app for managing all your accounts on iOS and Android.