I'd suggest: None of the above.

I get a lot of mail in the office, and those look like the "oh goodie-goodie. Here's another sales letter" headlines. Ask a question, provoke a thought -- engage the reader.

Mail today is full of a lot of hype, and after awhile you get jaded and skeptical. Find a headline (or question and answer) that will provoke a "Hey, Jimmy-bob, did you know THIS?" response in the reader.