Direct mail continues to prove itself time and time again. Several industries are returning to direct mail to power their integrated marketing campaigns. Most recently, we took a closer look at the insurance industry, which sent nearly 7 billion pieces of mail during 2012. The financial services vertical mailed nearly 8 billion pieces of mail during 2012, a staggering 38% of total volume tracked by market research firm Comperemedia. More specifically, the mortgage category mailed nearly 1.8....