MailForge

Built from the ground up for Mac OS X and Windows, MailForge is designed to be a power user's email client, providing users with a host of features not commonly found in other email programs, such as the ability to edit every facet of received emails, scheduled sending of email, tabbed or multi-window interface, HTML vs text options, menu navigation of mailboxes, etc.
Harnessing the power of SQLite, MailForge also offers significant performance advantages, ranging from the ability to have a virtually unlimited number of emails in a single mailbox, to search capabilities that offer near instantaneous results.

Even routine tasks, such as moving tens of thousands of emails from one mailbox to another, takes only seconds.
While MailForge already has a wide range of features, in the coming weeks and months we will be working hard to continue adding a large number of significant features and abilities to the program.