QR codes can be a great addition to your direct mail campaigns. They allow you to quickly and easily provide your customers with additional information or access to exclusive deals. For example, you could include a QR code on a postcard that links to a coupon code or a landing page with more detailed product information. You could also use a QR code to direct customers to a survey or customer feedback page. You can even use a QR code to link directly to a video or website that has more information about your product or service. There are countless ways to use QR codes in your direct mail campaigns, so get creative and see what works for you.