Free mail application

Here are some free mail applications that you can use:

1. Thunderbird: A popular and feature-rich email client developed by Mozilla. It's available for Windows, macOS, and Linux.
2. Microsoft Outlook: While not entirely free, Microsoft offers a free version of Outlook with limited features. It's available for Windows and macOS.
3. Gmail: Google's free email service is also available as a desktop application for Windows, macOS, and Linux.
4. Claws Mail: A lightweight and customizable email client for Windows, macOS, and Linux.
5. Sylpheed: A free and open-source email client for Windows, macOS, and Linux.
6. Geary: A modern and user-friendly email client for Linux and Windows.
7. Nylas Mail: A free and open-source email client for Windows, macOS, and Linux.
8. eM Client: A free email client for Windows and macOS with features like calendar integration and contact management.
9. Zoho Mail: A free email service with a desktop application for Windows and macOS.
10. ProtonMail: A free and secure email service with a desktop application for Windows, macOS, and Linux.

Please note that some of these applications may have limitations or ads, but they are all free to use.