NEWSLETTERS
While most writers will use a template or a newsletter mailing software to accomplish the task, writing successful newsletters that get results take a little bit more strategy:
"Done right, they will give you a return far better than any other marketing strategy," says Tamara Gielen, an independent e-mail marketing consultant who has worked for such companies as Cognos, eBay, and OgilvyOne. "But success largely depends on two things: relevance and permission. Sending irrelevant messages to recipients who didn't give you permission to e-mail them will not only hurt your brand, it is also the fastest way to get blacklisted with the major ISPs. The last thing you want is to be perceived as a spammer."
GREAT RESOURCES:
http://www.inc.com/guides/2010/07/how-to-write-an-e-newsletter-that-gets-results.html