Top 10 Free Mac Email Programs

Mac OS X Mail is a solid, feature-rich and spam-eliminating, but also an extremely nice and easy to use email client.

Mozilla Thunderbird is a fully featured, secure and very functional email client. It lets you handle mail efficiently and with style, and Mozilla Thunderbird filters away junk mail too.

Eudora, a classic email client, feels surprisingly fresh and alive, and continues to be one of the best programs you can use to handle your mail.

The Opera email client is a slick and flexible interface that will satisfy almost all your email needs, and Opera integrates RSS feeds in this experience as well. Some may find the message editor lacking a bit in power, and the absence of support for encrypted email is unfortunate.

Mulberry is a powerful and incredibly versatile email client available for all the popular platforms. If there is something Mulberry lacks, it is simplicity.

Mailsmith, the email client from the makers of BBEdit, is just as powerful and feature-rich as the text editor.
It's a pity Mailsmith supports POP accounts only, and a — adequately empowering — rich-text editor could be a neat addition, too.

Never underestimate Mozilla! The email component of this open source browser is a solid performer, fully featured and handsomely usable.

Alpine is powerful console email program that makes you use email productively with automation aplenty and nary a distraction.

GNUMail.app is a slick email client with solid support for multiple accounts and powerful filters.

If you're still using the classic Mac OS, Outlook Express will serve you well as a solid and feature-rich email client.