Case Studies & Worked Examples

Realistic ROI walkthroughs for direct mail campaigns across the verticals PostKnock serves. Use these as planning models for your own campaigns.

All case studies on this page are worked examples, not real customer testimonials.

PostKnock launched in 2026 and we don't yet have a roster of customers we can name publicly. Rather than fabricate testimonials, every case study below uses a clearly hypothetical practice or company profile, combined with industry-benchmark response rates from sources like the ANA Response Rate Report and the USPS Household Diary Study, to model what a typical campaign returns. Real testimonials require real customer permission — we will publish those as soon as our first customers give us the green light. Until then, these worked examples are designed to help you plan your own campaign math honestly.

Dental · Recall ROI

Dental Recall Campaign: 3 Waves, $30K ROI

Hypothetical 4-chair family practice, 600 lapsed patients, 3-wave postcard + phone follow-up campaign at $1,719 total cost. Models 8% cumulative response, 48 reactivated patients, $57,600 first-year revenue, 33:1 ROI.

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HVAC · Seasonal Tune-Up

HVAC Spring Tune-Up: 1,500 Customers, $33K Revenue

Hypothetical 8-tech residential operation, 1,500 inactive past customers, 2-wave spring maintenance campaign at $2,469 total cost. Models 75 booked tune-ups, $33K ticket revenue plus $7,560 maintenance plan recurring.

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Optometry · Insurance Recall

Optometry Benefits Recall: $19K From 800 Postcards

Hypothetical solo-doctor practice, 800 patients with year-end vision benefits expiring, 2-wave use-it-or-lose-it campaign at $1,363 total cost. Models 6% response, 48 booked exams, $22,700 revenue with multi-pair upsell.

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Chiropractic · Care Plan Reactivation

Chiropractic Care Plan: 5% of Lapsed Patients in 90 Days

Hypothetical solo-DC practice, 400 patients lapsed mid-care-plan, 3-wave reactivation campaign at $1,245 total cost. Models 5% response, 20 reactivated patients, $20K first-year revenue. Includes the conversion call script.

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Pest Control · Annual Renewal

Pest Control Annual Renewal: $22K From 1,000 Customers

Hypothetical 4-tech residential pest control operation, 1,000 expiring annual contracts, 2-wave continuity-focused renewal campaign at $1,679 total cost. Models 50 renewals at $450 average, $25,500 revenue with 30% add-on attach.

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Want to model your own campaign?

Plug your customer count, average ticket, and target response rate into our ROI calculator to see what a campaign like these returns for your business.

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