According to Smallbiztrends.com, 75% of their survey respondents say they are likely to use coupons they received in the mail — even more than those who plan to use coupons received by email or found online.
Be sure to include an offer with your direct mail campaigns. You can create a sense of urgency; time-sensitive offers can get customers into your store during off times of the week. Offer a discount on multiple purchases. These types of offers increase sales and allow for easy tracking of return on your campaigns.