Mac mail client free

Here are some free Mac mail clients you can use:

1. Thunderbird: A popular, open-source email client that's available for Mac. It's highly customizable and supports multiple email accounts.
2. Postbox: A free email client that's designed to be fast, secure, and easy to use. It supports multiple email accounts and has features like customizable themes and add-ons.
3. Spark: A free email client that's designed to be fast and easy to use. It supports multiple email accounts and has features like customizable themes and a built-in calendar.
4. Airmail: A free email client that's designed to be fast and easy to use. It supports multiple email accounts and has features like customizable themes and a built-in calendar.
5. Gmail: If you have a Gmail account, you can use the Gmail web client on your Mac. It's free and has many features like labels, filters, and integration with other Google apps.
6. ProtonMail: A free, open-source email client that's designed to be secure and private. It supports multiple email accounts and has features like end-to-end encryption and a built-in calendar.
7. Mailplane: A free email client that's designed to be fast and easy to use. It supports multiple email accounts and has features like customizable themes and a built-in calendar.

All of these options are free to download and use, and they're compatible with Mac OS X 10.9 or later.