This document provides 11 useful direct marketing tips. It advises marketers to not underestimate direct marketing and to always test databases before renting them. Small changes through testing can bring significant results. Marketers should use customer data to personalize communications and explain benefits in detail with long copy. They should prove their claims with evidence and value building a quality database. Marketers need to be clear in their messaging so people hear and read what is most important. Overall, the tips encourage marketers to test, optimize, and personalize direct marketing efforts.