Foxmail
Foxmail is a free POP3 and IMAP4 e-mail client in English and Chinese for Windows systems.
20 Alternatives To Foxmail
Apple Mail
There’s big news attached.
Canary Mail
Privacy-aware email app for Mac & iOS
Claws Mail
Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response
Evolution
Apps/Evolution - GNOME Wiki!
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
Nylas Mail
The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.
Open365
The open source cloud with LibreOffice online - LibreOffice online + Seafile + KDE.
Outlook
Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Pale Moon
Pale Moon is an Open Source, Mozilla-derived web browser available for Microsoft Windows and Linux, focusing on efficiency and ease of use.
Pegasus Mail
Pegasus Mail has been in existence longer than any other PC email client.
Polymail
Native email app for email productivity.
Postbox
The Power Email App for busy professionals, like you.
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).
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.
Windows Live Photo Gallery
Get help and how-to info for Windows Essentials—including Windows Live Mail, Movie Maker, and more.
Zimbra Collaboration Suite
Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more.
eM Client
eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.
iRedMail
A fully fledged, free email server solution, an open source project (GPL v2).