Correo is a new open-source mail client for OS X. Correo combines two popular Mozilla projects, Camino and Thunderbird, to create a polished native Macintosh application.

Current list of features are:

• Create multiple mail accounts (POP and IMAP);
• Reply, Forward, and write new messages (via SMTP); and
  
• Ability to setupinterface for 2 column split view or 3 column view.
  

There are many planned features for the mail client, including:

• plugin capability (to allow development of extensions such as PDA synchronization);
• tabbed window interface;
• address book support;
• keychain access; and
  
• various other to-be-determined features.

Download Correo 0.1 to test it out. A word to the cautious: Be Careful! This is a 0.1 application, meaning its a brand, spanking new beta. Mke sure you have a back-up of your Mac just in case something weird happens. You can read the wiki for support and development information.

Correo is currently in the early stages of development, and the latest release for the application is the 0.1 release.

Correo - a new mail client for OS X