Mutt!

Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.

eM Client is a full featured email client with a modern and easy to use interface. - offers calendar, tasks, contacts and even chat.- fully optimized to run smoothly on Windows XP, Vista, 7, 8 and 10.- supports all major services including Gmail, Exchange, iCloud, and Outlook.com.- easily imports your data from most of the other e-mail clients. This includes Microsoft Outlook, Outlook Express, Windows Mail, Windows Live Mail, Thunderbird, The Bat and more.- fully supports touch devices like touch-enabled laptops, tablets and hybrid devices. Use your email client easily in a modern way.- finds any email, contact or attachment in seconds with eM Client's super-fast search. »

Apple Mail changes the way you interact with your email every day.

Mailbird is a Windows based email client which design and style match Windows 7, 8 and XP’s native styles. Mailbird provides clean, simple and lightning fast email experience.

Opera Mail powerfully organizes, indexes, and sorts your messages.

Postbox is an email application that helps you organize your work life and get stuff done.

Geary is a lightweight email program designed around conversations and built for the GNOME desktop.

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

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

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

Polymail is the modern email client, redesigned.

Icedove is the Thunderbird email client rebranded by Debian .