Based on our recent study of magazine publisher emails, there are four sales email formats that appear to be the most common for publishers marketing to their own house email lists (i.e. free newsletter subscribers).

In short, they are:

1. "The Postcard"
2. "The Billboard"
3. "The Offer Header Letter"
4. "Long Letter Cluster-Bombing"
5. Hybrids of the Above

A detailed article, with graphical examples of each format and tips about which ones work most in which markets, appears at this link to circman.com.