Note: Mail Toolbox is no longer under development, and it is no longer available for sale.Mail Toolbox is the son of Mail Siphon combined with Mail Watcher. It's been written from scratch as a Cocoa application specially designed for Mac OS X v10.2 (Jaguar) and v10.3 (Panther).
Mail Toolbox is many tools in one application. It can be seen as the Swiss Army knife for managing e-mailboxes. You can use Mail Toolbox as an online mail client, a mail watcher, a tool to delete SPAM, etc.
Mail Toolbox is a true e-mail agent (to receive and send messages). It has the honor of being the only online agent of its kind for Mac OS X. It supports: POP3, APOP, IMAP and SMTP.