Nonprofit Lapsed-Donor Reactivation: Letter vs. Postcard Head-to-Head
Quick answer
Real split-test data comparing a personalized letter package to a jumbo postcard for nonprofit lapsed-donor reactivation, plus which format wins by donor tier.
We split-tested a #10 letter package against a jumbo postcard for lapsed donors on a 3,800-name file. The winner surprised the fundraising team.
## The setup
A regional nonprofit (arts organization, ~$4M annual revenue, ~11,000-name active-donor file) came to us with a lapsed-donor problem. Donors who had given in FY22 or FY23 but not in FY24 or FY25 numbered **3,847 records**. Their instinct was to send a personalized letter package — the traditional fundraising move. Their board treasurer wanted a cheaper postcard.
We proposed a split test.
## The test design
- **Cell A — Letter package** (1,924 donors, random split): #10 outer envelope with teased copy, 2-page personalized letter, response device, BRE (business reply envelope). Personalized ask amount based on prior giving. Nonprofit Marketing Mail rate.
- **Cell B — Jumbo postcard** (1,923 donors, random split): 6x11 postcard, personalized first name + prior gift year + suggested amount. QR to donation page, phone number, mailing address for check gifts. Nonprofit Marketing Mail rate.
Both cells had identical suppression rules, identical creative themes, identical drop dates, and the same landing page destination for QR/URL responses. Only the format changed.
## The costs, per cell
| Line item | Letter (Cell A) | Postcard (Cell B) |
|---|---|---|
| Print, personalization, insertion | $1.42/piece | $0.58/piece |
| Postage (Nonprofit Marketing Mail) | $0.31/piece | $0.29/piece |
| List processing | $0.04/piece | $0.04/piece |
| **All-in cost per piece** | **$1.77** | **$0.91** |
| Total cell spend | $3,405 | $1,749 |
Letter package cost ~2x the postcard cell. So the postcard would win on ROI only if the letter didn't produce 2x the response.
## The results (measured over 60 days)
| Metric | Letter (Cell A) | Postcard (Cell B) |
|---|---|---|
| Pieces mailed | 1,924 | 1,923 |
| Total gifts received | 87 | 62 |
| **Response rate** | **4.52%** | **3.22%** |
| Total dollars raised | $18,940 | $9,215 |
| **Average gift** | **$217.70** | **$148.63** |
| Cost per dollar raised | $0.18 | $0.19 |
| Net revenue (raised − mail cost) | $15,535 | $7,466 |
| Net per 1,000 records | $8,074 | $3,883 |
**The letter won on absolute dollars — by more than 2x.** It also won on average gift and total gifts.
The postcard won on… nothing, when measured net.
## Why the letter won
Three things:
1. **Average gift was 46% higher.** Lapsed donors who reactivate through a serious, personalized letter give closer to their prior giving level. Postcard responders defaulted to the lowest suggested amount much more often — and gave more small $25–$50 gifts.
2. **The envelope earned "open" behavior.** A jumbo postcard is triaged in 2 seconds. A #10 with teased copy asks the recipient to slow down. For a lapsed donor deciding whether the org still deserves attention, that slowdown matters.
3. **The response device and BRE lowered friction for check writers.** Roughly 40% of the letter gifts came in via mail (checks and mailed cards). The postcard forced 100% online or phone, which excludes a big chunk of older donors.
## Where the postcard still wins
Segment the file by prior-gift tier and the picture changes:
| Prior gift tier | Letter response | Postcard response | Winner |
|---|---|---|---|
| <$50 (small dollar) | 3.1% | 3.4% | **Postcard** |
| $50–$249 | 4.6% | 3.3% | Letter |
| $250–$999 | 6.9% | 2.8% | **Letter (by a lot)** |
| $1,000+ | 9.4% | 1.6% | **Letter (by a lot)** |
Small-dollar donors respond about the same rate to either format, so the cheaper postcard wins on efficiency. Mid- and major-donor tiers respond dramatically better to letters — and give more.
## What we recommend based on this test
- **Any lapsed donor with a prior gift of $50+ should get the letter treatment.** The math is not close.
- **Small-dollar lapsed donors ($1–$49) can go to a postcard-only cell** — the response is close enough that the postcard's lower cost wins.
- **Never postcard your major donors.** It reads as impersonal and lowers the average gift when they do respond.
- **Always include a BRE on the letter.** Older donors mail checks. It's still true.
## Timing and cadence
This nonprofit ran the split as a one-shot. We'd recommend a follow-up second touch (postcard or short letter) to non-responders at day 30. Based on this org's response curve, we'd project another 1.2–1.8% incremental response, roughly doubling program net.
## What this means for your year-end appeal
Year-end appeals face this same decision every October. If you're a nonprofit sizing your November/December mail plan right now:
- Segment lapsed donors by prior gift size before choosing format.
- Budget for the letter package on anything above $50 lifetime giving.
- Postcards are additive to letters, not a replacement for them. Use postcards as second-touch reminders, or for the smallest-dollar tier as their only touch.
Our [Nonprofit Year-End Appeal Planning post](/blog/nonprofit-year-end-appeal-planning-start-now-mail-in-november) walks through the calendar for a November drop.
## Related reading
- [Nonprofit Membership Renewal: How a 4,200-Piece Letter Drop Lifted Renewals 38%](/blog/nonprofit-membership-renewal-4200-piece-letter-drop-38-percent-lift)
- [Mailing List Quality vs. Size: When a Smaller List Beats a Bigger One](/blog/mailing-list-quality-vs-size-when-smaller-lists-outperform)
- [First-Class vs. Marketing Mail Postcards: When the Extra 24¢ Actually Pays Off](/blog/first-class-vs-marketing-mail-postcards-when-24-cents-worth-it)
Or price your own appeal on our [Direct Mail ROI Calculator](/tools/direct-mail-roi-calculator).
For a free quote, call (562) 261-9100 or contact us online.
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