When you double-click on an attachment in Mail, what happens to that original attached file? What happens if you then edit it? The answer: It depends.
For some people, plain text email is fine. Others like fancy fonts, graphics, and signatures. Whichever way you swing, here's how to make Mail use the formatting you want, when you want it to.
Swap search shortcuts, customize the Favorites bar, redirect messages (instead of forwarding them), and other smart tips for Mail.