# Attribution for Direct Mail and QR Code Campaigns

Source: https://attributionplaybook.com/blog/2026-10-15-attribution-direct-mail-qr-code-campaigns.html

October 15, 2026

*Direct mail is back in DTC budgets, and its attribution is a blend of scans, codes, and matchbacks. How to credit mail honestly without pretending every later order was caused by a postcard.*

Postcards and catalogs are landing in DTC media plans again, partly because digital costs keep climbing and partly because a physical piece stands out. The measurement problem is old, though. Mail has no click. A shopper gets a postcard, and days later orders from their phone after a brand search, and every channel in the path wants the credit.

Mail attribution works when a brand combines several imperfect signals and agrees the rules in advance. Scans, codes, and matchback analysis each tell part of the story, and pretending any one of them is exact produces bad budget decisions.

## QR scans measure curiosity, not revenue

A QR scan is the closest thing mail has to a click, and it is worth tracking precisely: unique codes per drop and per audience segment, a landing page built for the offer, and scan to order tracking from that page. But scans undercount badly. Many shoppers skip the code and type the brand name or search later. Treat scan revenue as the floor of a campaign's effect, useful for comparing creative and segments, useless as the total.

## Promo codes and vanity URLs catch the deliberate buyers

A mail specific code or short URL captures shoppers who remember the offer and act on it, usually the highest intent slice. Give the mail code a reason to be used, like the clearest discount, and expect leakage: codes get shared to coupon sites, which inflates mail's numbers and steals credit from other channels. Monitor where codes surface, and judge a drop on code revenue plus the matchback, never on code revenue alone.

## Matchback analysis does the heavy lifting

A matchback compares the mailed list against orders in a window after delivery, flagging orders from mailed households whatever path they took. Set the window honestly, commonly two to four weeks for considered purchases, and subtract the baseline: some of those households would have ordered anyway. A holdout group that receives no mail turns a matchback from a story into a measurement, showing the lift mail actually caused.

## Reporting mail alongside digital channels

Keep mail in its own reporting line with its own method, and resist folding matchback orders into platform dashboards where they will be double counted against search and social. In blended reporting, show mail's incremental orders from the holdout as the headline, with scans and codes as supporting detail. Finance and the media team can both live with that, because it is the same standard incrementality asks of every other channel.

## Related reading

If this topic is useful, these earlier guides go deeper on connected questions: [Attribution for Podcast and Radio Ad Spend](https://attributionplaybook.com/blog/2026-10-15-attribution-podcast-radio-ad-spend.md), [Blended ROAS vs Platform ROAS: Which Number to Trust When They Disagree](https://attributionplaybook.com/blog/2026-10-13-blended-roas-vs-platform-roas.md), and [Incrementality Testing for DTC Brands: When Attribution Is Not Enough](https://attributionplaybook.com/blog/2026-10-12-incrementality-testing-dtc-guide.md).

## Frequently asked questions

### How do you attribute sales to direct mail with no clicks?

By combining signals: QR scans and mail specific codes for the visible slice, and matchback analysis against the mailed list for the rest, ideally with a holdout group to estimate how many orders would have happened anyway.

### What attribution window suits direct mail?

Longer than digital. Mail sits in homes and triggers purchases days or weeks later. Two to four weeks after delivery is a common honest window for considered DTC purchases, agreed before the drop rather than stretched after results disappoint.

### Do QR codes capture most mail driven orders?

No. Scans are a minority of responses. Many shoppers search the brand or type the address directly. Scans are excellent for comparing segments and creative, but they understate total response, so budgets should not be set on scan revenue alone.

### Why use a holdout group for mail?

Because matchbacks credit mail for orders that would have happened regardless. Mailing 90 percent of a list and holding out 10 percent shows the real lift, and it is the difference between mail that earns its budget and mail that harvests existing demand.

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