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The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.
Gammadyne Clyton - Clyton is an email client with advanced security and spam filtering features.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Geary - Geary is an email application built for GNOME 3.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.