EtPanKit

EtPanKit is an Objective-C interface for the libEtPan email framework for Mac. It features fast, efficient, and secure IMAP and SMTP connections, abstract classes for maximum subclass-ability, an abstraction from the LibEtPan C-interface, IDLE requests, NSOperation based classes which are submitted asynchronously to their queue, and block-based and delegate-based callbacks for operations.

This particular fork is under active development because of it's use in the DotMail project.