USPS delivers a lot of mail especially during the winter holidays. In this best direct mail campaign example, the USPS uses a self-mailer to promote its line of holiday stamps and gifts and makes it easy for consumers to take action using QR codes or custom URLs. 39% of consumers will use a QR code to take action on a direct mail piece and this figure rises to 44% for those aged 35-54 and over half (51%) for those aged 18-34.
USPS also does a great job including festive holiday touches on its direct mail campaign including a bright red bow where a stamp would be placed, and holiday inspired images including trees, and packages being delivered with care.
Source: Who's Mailing What!