Word Level 3 Marketing Applications: Course Objectives: Contrary to popular belief, direct mail is still an extremely effective marketing tactic. Research shows email typically receives a response rate of about 0.12%, while direct mail still gets a whopping 4.4% response rate. Understanding how mail merge services work is the key to your direct mailing success. Mail merge can be used for letters, envelopes, labels, postcards, and more. Your mail merge templates can include custom colors, graphics, and typography. Pre-requisite - Level 2 type experience with word.