It started with a problem.
Aaron Montgomery Ward sent the first mail-order catalog in 1872 — a single sheet listing goods available to rural customers who could order by mail and receive delivery by post. This is often cited as the beginning of direct mail in the United States. By the early twentieth century, direct mail had evolved into a discipline with specialized firms creating and managing mailing lists. The Direct Marketing Association, founded in 1917, formalized the industry's practices. The 1960s and 1970s saw the development of demographic list segmentation — the practice of selecting which names to mail based on characteristics correlated with purchase likelihood.
Historical sources below ↓Then something changed.
Direct mail introduced the concept of measurable marketing. Unlike newspaper advertising, where response was difficult to trace to a specific ad, direct mail could include a coupon, a return envelope, or a response code that made it possible to count how many recipients responded. This made it possible to calculate cost per response and cost per customer, compare the returns on different offers and lists, and make data-driven decisions about what to send, to whom. The discipline of A/B testing — sending two versions to matched groups to compare response rates — originated in direct mail before migrating to digital marketing.
What a builder can learn.
Our interpretation: direct mail introduced measurable response to marketing. Every element that made direct mail measurable — a specific offer, a response mechanism, a target list — applies equally to email, digital advertising, and any marketing channel. For a business builder, the direct mail discipline is relevant regardless of the channel: the offer should be specific, the audience should be defined, the response should be trackable, and the results should be compared against the cost.
A door still open.
A hypothesis worth testing: if a small business sent the same offer to two different segments of its existing contact list — customers who had bought once versus customers who had bought more than once — and measured the response rate from each, would the difference in response rates justify different offers, timing, or communication strategies for each segment?
Of all the marketing activities your business does, which one has a measurable cost-per-customer-acquired, and what does that cost tell you about whether to do more or less of it?
Follow the evidence.
History is sourced below. Business lessons are editorial interpretations; future possibilities are questions to test, not predictions.
Prepared from primary-source histories. First edition: 25 Sept 2026.