FastTrackMail is one of the fastest known email client available today and the best email program for people who get huge amounts of correspondence. . 

FastTrackMail Lite offers a new, simple and very convenient interface for processing e-mail and it's a powerful email management tool with features to increase your productivity and enhance your communications. The program provides extensive filtering and processing capabilities for incoming correspondence and requests.  It allows automatic sorting of incoming messages based on preset criteria and their placement in individual folders or mailboxes where they can be viewed at a later time. 

You can easily customize the interface to handle all your messaging needs.  The email client can store information on many e-mail accounts.  Options are also provided for standard e-mail clients: support of attachments, plain text and graphic html messages, message sorting by date, subject, address or other fields, message searches based on key words, etc.