Don’t want your direct mail to end up in the trash with the rest of the unread mail? Studies show an effective direct mail campaign should draw a .5 to 1 percent response. These 10 tips will help you get the results you want:1. A clear, bold headline. On the envelope or front of the mailer there should be one central message. The best way to achieve that is with a bold, clear headline that’s not cluttered up with other text. A good guideline is to have the headline fill up at least 15% of the fr.