Mailspring

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

22 Alternatives To Mailspring

Afterlogic Webmail

Webmail is an open-source webmail script for existing IMAP servers.

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!

Front App

multi-channel inbox service for collaborative teams
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Gmail

Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.

GyazMail

GyazMail is an advanced level of an email account management system for the Mac OS X operating system users.
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MailMate

MailMate is an alternative email client that was designed for the macOS.

Mailbird

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

Mu4e

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

Mutt

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

Nylas Mail

The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.
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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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ProtonMail

Secure email with absolutely no compromises. Get your free encrypted email account today.

Roundcube

Web-based IMAP email client

Shift

Shift is the ultimate email client for managing Mail, Calendar, Drive, Slack, Asana, Jira, Evernote, and all your other favourite apps
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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).
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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.