Outspring Mail for Mac

From Outspring:

Imagine an email program that was smart enough to observe and learn how you handle your email. Like offering to reply to certain types of email messages using a response you've previously sent. Or giving you the option to auto-file a message you've read based on how you've filed similar messages in the past. What if you could defer a message from your inbox for a few days or weeks, so that it magically reappears later when you're ready to deal with it? What if this program had an amazing junk mail filter that would leave your inbox devoid of spam? And what if this program was as familiar and easy to use as Apple Mail?

After three years in development, we've finally created that program. Outspring Mail is the newest email client for Macintosh. We've taken the best features of existing email programs and coupled them with our patent-pending intelligent functions to create a program that will make your email chores far easier. And since this is a current-generation application, it supports major email protocols including POP, IMAP, SMTP and SSL. It also runs natively on the latest Macintosh computers and OS X Leopard.