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!

Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

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

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

K-9 Mail - K-9 is an opensource email client making it easy to chew through large volumes of email.