When you think of cutting-edge marketing, direct mail is not what comes to mind. And yet, despite previously declining numbers, it’s proving to be a resilient marketing niche, and still represents the largest local advertising spend of $38.5 billion in 2020. There is a sort-of minimalist purism in direct-mail marketing. The message is delivered to the prospect, and that’s it. No cookies, no click-throughs, just a pass or fail, convert or wind up in the garbage can. And, with open rates of up to 90%, and a 28% better conversion rate than digital channels, there is at least one key principle that can help any digital marketer concentrate their efforts more efficiently.