Mac OS X Mail 4.1 - Speed, and a New Feature or Two

With newfound speed, Snow Leopard's updated Mac OS X Mail brings almost no new features: improved support for Exchange 2007 accounts and a way to enter text snippets fast. Mail folders can now be arranged arbitrarily, too.
›› Mail is the solid, powerful and easy to use email program built into Mac OS X. While Mail's smart spam filter gets rid of practically all junk mail, the astonishingly fast and precise search and smart folders make finding and managing good mail a snap. (Mac)