Kontact - KMail Alternatives

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

Geary is an email application built for GNOME 3.

Visual 24h analog calendar clock, designed to help manage ADHD and time blindness with todo lists and one-tap multiple reminders.

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

Apps/Evolution - GNOME Wiki!

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

Kube is a modern communication and collaboration client built to just work.

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

Mutt is a small but very powerful text-based mail client for Unix operating systems.

Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response

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.

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Balsa is an e-mail client for GNOME, highly configurable and incorporating all the features you...

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