Mutt

Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.

20 Alternatives To Mutt

Airmail

Airmail is a lightweight and lightning fast mail client for Mac.

Alpine

Alpine is a fast, easy to use email client that is suitable for both the inexperienced email user…
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Apple Mail

There’s big news attached.
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Claws Mail

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

Apps/Evolution - GNOME Wiki!
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Geary

Geary is an email application built for GNOME 3.

Kontact

Kontact is the integrated Personal Information Manager of KDE.

Kontact - KMail

Email client by KDE, supporting POP3 and IMAP mailboxes.

Mailbird

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

Mailspring

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

Mu4e

Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.

NeoMutt

NeoMutt is a command-line mail reader. It’s a version of https://alternativeto.
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OpenProject

OpenProject is an open-source project management software with a wide set of features and plugins.
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Outlook

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

The Power Email App for busy professionals, like you.
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Spark

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

Sylpheed

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

byobu

Byobu is a GPLv3 open source text-based window manager and terminal multiplexer.
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eM Client

eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.

sup

The first creep-free way to see nearby friends