This is a big list of headlines and subject lines used on KopywritingKourse over the years, with their corresponding open rates.Visit Link
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This is an email template used by Amazon that includes it’s sizing guidelines and some written guidelines (which are an excerpt from a book by copywriter John Caples).
This is an interesting little article about writing good headlines from a newspaper article. It has a couple of interesting anecdotes that are very helpful. This is from the New Mexico Business Journal 2004.