Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Alpine - Alpine is a fast, easy to use email client that is suitable for both the inexperienced email user...
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.