Also, you might ask yourself if the recipient really wants to be included in your mailing list in the first place. Did you ever ask them?
How not to annoy people via e-mail
http://m.cnn.com/primary/wk_article?articleId=urn:newsml:CNN.com:20120201:group-emails-netiquette:1&branding=sprj.ntqt&category=cnnd_tech&pagesize=10
