How to get your prospects to open your mail

Direct mail is a tried-and-proven marketing tactic. For tips on what to do with your envelope see this article from Marketing Profs. The article discusses the 2 main envelope treatments:
1) Make it look like personal mail.
2) Make it look like a billboard.

Don't make the same mistake of many business owners by being half-done - like putting a "soft" promotional statement on the front and still trying to make it look personal. It doesn't work. Where possible test different options so you know what works for your audience.