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An extensible email, newsfeed, chat, and calendaring client

Robust Email Management Tool with Strong Security Measures

A lightning-fast mail client for OS X

The Best Email Client for Windows

Enhanced ProtonMail desktop client

Faster way to send and manage your digital mails

Easily access all your emails from one app

A fine-tuned version of Mozilla Thunderbird

A soft fork of Mozilla Thunderbird

A fully-featured email client app

The Best Secure Email Client Software

Receive email notifications on your Mac's taskbar