Response tracking measures how many recipients act on a mailing, using methods such as QR codes, custom or vanity URLs, promo codes and dedicated phone numbers.
These are the tracking methods Printing for Less lists in its EDDM® FAQ. Use a different code, URL or number for each campaign so results can be compared.
Also called: EDDM® tracking, Campaign tracking, ROI tracking
Related: QR Code Vanity URL Promo Code Every Door Direct Mail® (EDDM®)