Quick answer
Charity direct mail is a printed appeal posted to a named supporter or prospect, asking for a gift. A typical pack has an outer envelope that gets it opened, an appeal letter that tells one clear story and makes the ask, a reply form with suggested amounts and a Gift Aid declaration, and a reply envelope. Warm mail to existing supporters is where charities make their money: JICMAIL's UK benchmarks put warm charity mail at an 11.5% response rate and £10.00 return per £1, against 0.7% and £0.20 for cold acquisition mail (2022–2025 averages). Cold mail recruits the donors that warm mail then keeps.
Key takeaways
- Treat cold acquisition as an investment, not a profit centre. JICMAIL's charity benchmark for cold mail is a 0.7% response, £27 average gift and £161 cost per acquisition.
- Warm appeals to existing supporters are the engine of charity mail: an 11.5% average response and £10.00 return on investment in JICMAIL's charity benchmark.
- Every component has one job. The envelope gets opened, the letter makes the case, the form makes giving easy and the reply envelope gets the gift back.
- Ask-string personalisation sets suggested amounts from each donor's own giving history, so a £15 donor is not asked for £5.
- Gift Aid adds 25p to every £1 from a UK taxpayer, so a clear declaration on the reply form is worth real money.
What charity direct mail is and why charities still use it
Charity direct mail covers any printed fundraising communication posted to a named person: cold appeals to people who have never given, warm appeals to existing supporters, raffle and lottery packs, thank-you letters and newsletters. It sits alongside digital fundraising rather than replacing it, but it is still the channel many charities rely on for their core income from individual donors.
The reason is response. JICMAIL, the UK's industry measurement body for mail, tracks response rates by sector. Its charity benchmarks show a large gap between mail to people who already support a cause and mail to people who do not:
| Charity mail type | Response rate | Return per £1 | Cost per acquisition | Average gift |
|---|---|---|---|---|
| Warm direct mail (existing supporters) | 11.5% | £10.00 | Not reported | £104 |
| Cold direct mail (prospects) | 0.7% | £0.20 | £161 | £27 |
| Partially addressed mail | 0.7% | £0.50 | £123 | £27 |
| Door drops | 0.2% | £1.10 | £155 | £61 |
Read the two rows together. Cold mail recruits donors at a loss on their first gift; warm mail is where those donors pay back, gift after gift. That is why a fundraising mail programme needs both, and why donor retention matters as much as recruitment. For the wider benchmarks across sectors, see our guide to direct mail response rates.
Anatomy of a charity appeal pack
Most appeal packs are built from the same handful of components. Each one has a single job, and a pack works best when every piece is planned together rather than designed in isolation.
| Component | Its job | What makes it work |
|---|---|---|
| Outer envelope | Get the pack opened | A short teaser line or image that hints at the story inside. A window shows the supporter's name and address, printed on the letter or form so the two always match. |
| Appeal letter | Make the case and the ask | One person or one problem, told plainly. A specific ask (what £25 does), repeated near the end. A P.S. that restates the ask, because many readers look there first. |
| Reply or donation form | Make giving easy | Pre-printed name, address and supporter number. Suggested amounts that match the letter. Clear payment options. A Gift Aid declaration and a simple way to change contact preferences. |
| Reply envelope | Get the gift back | Freepost or business reply, sized so the form goes in without awkward folding. |
| Insert or premium | Lift engagement | A leaflet, photo card or small item such as a pen, coin or seed packet. It adds weight and thickness, which can change the postage. |
The rules each component must meet, from charity registration statements to Gift Aid wording, are in our charity appeal pack checklist, with a printable version to tick off as the pack comes together.
Plan the envelope last, not first
The largest item sets the envelope size and the total sets the weight and thickness, which decides the Royal Mail format and price. Agree the contents first, then choose the envelope. Our envelope sizes guide shows which sizes stay within the cheaper Letter format.
Cold acquisition vs warm appeals
| Cold acquisition | Warm appeal | |
|---|---|---|
| Who receives it | People who have not given before | Existing donors and supporters |
| Where the data comes from | Rented or bought lists, partially addressed mail or door drops | Your own supporter database |
| What it is for | Recruiting new donors | Raising income and keeping supporters giving |
| Personalisation | Name and address; sometimes a segment-based version | Name, giving history, ask string, campaign history |
| Typical pack | Often fuller, sometimes with a premium to stand out | Often simpler: letter, form and reply envelope |
| How to judge it | Cost per new donor and that donor's value over time | Response, average gift and return on investment |
For cold mail, the data source shapes everything. Renting a list gives you named prospects who match a profile; our guide to renting or buying a mailing list covers the questions to ask a broker and the ICO's due diligence expectations. Partially addressed mail reaches households in chosen postcodes without a named list, and door drops reach every letterbox in an area. JICMAIL's charity benchmarks above show how each compares.
Charity appeals fall within Royal Mail's definition of Advertising Mail, which includes mail that encourages 'contribution to, or support of a cause'. That gives access to the lower Advertising Mail tariffs if the mailing meets the volume and data rules. See Royal Mail Advertising Mail explained for the details.
Personalising appeals and testing what works
Personalisation in charity mail goes beyond 'Dear Mrs Smith'. The most valuable form is the ask string: the suggested gift amounts printed on the letter and form. Instead of asking every supporter for £5, £10 or £25, each donor is asked for amounts calibrated to their last gift. A donor whose last gift was £15 might see £15, £25 or £50. You set the rules; the data drives the print.
Other common variables include the campaign the supporter first responded to, the length of time they have supported you, the signatory and a version of the story chosen for their interests. All of it is produced with variable data printing, and the guide explains how personalised text, images and versions are proofed and checked.
- 1
Test one thing at a time
Change a single element between versions, such as the ask amounts, the envelope teaser or the premium. Change several and you will not know which made the difference.
- 2
Give every version a code
Print a version or source code on each reply form. When gifts come back, the code tells you which version and which data segment produced them.
- 3
Split the data at random
Allocate records to each version randomly within the same segment, so the groups are comparable.
- 4
Make the cells big enough
With cold response rates below 1%, small test cells produce too few replies to read. Agree cell sizes with whoever will analyse the results before you mail.
- 5
Measure the full value
Judge cold tests on cost per new donor and on how many of those donors give again, not only on the first gift.
Appeal packs printed, personalised and posted in Keighley
Ask-string personalisation, Gift Aid inserts, raffle and lottery packs and pen, coin or seed packet enclosing, all under one roof.
Explore the serviceGift Aid on appeal forms
Gift Aid lets a charity claim an extra 25p for every £1 donated by a UK taxpayer, at no cost to the donor, provided their gifts are no more than four times the tax they paid in that tax year. On an appeal pack, the Gift Aid declaration usually sits on the reply form.
HMRC sets out what a declaration must contain: the donor's name and home address, the charity's name, which gifts it covers and confirmation that they are to be treated as Gift Aid, plus an explanation that the donor must pay enough tax. A signature is not required. Our charity appeal pack checklist lists the points in full. For warm supporters, pre-print the declaration status so donors who have already made one are not asked again.
Fundraising rules to build in from the start
Charity mail sits under the Fundraising Regulator's Code of Fundraising Practice as well as data protection law. The points that most often shape a mailing are:
- Suppression. Without specific permission to contact someone, the Code requires you to check against the Fundraising Preference Service, the Mailing Preference Service and the Telephone Preference Service, and to stop contacting people you know have died (standard 8.4.1). See our MPS guide.
- Frequency. You must be able to justify how often you contact people about fundraising (standard 8.4.4).
- Opting out. Offer a simple way for people to tell you they do not want to hear from you (standard 8.4.3), and remind supporters of their preferences (standard 8.4.2).
- Lawful basis. Postal fundraising to individuals usually relies on legitimate interests under UK GDPR. Our GDPR and direct mail guide explains how that works and what the right to object means.
- Registration statement. Registered charities above the income threshold must say they are registered on appeal materials. The checklist covers the wording for England and Wales and for Scotland.
General guidance, not legal advice
This guide summarises published rules and guidance. Check the Code of Fundraising Practice and take advice on your own circumstances.
Sources
- JICMAIL – Response Rate Tracker, full year 2025 update (charity sector benchmarks)
- Royal Mail – User Guide for Royal Mail Advertising Mail, April 2026 (archived copy)
- GOV.UK – Gift Aid
- HMRC – Charities: detailed guidance notes, chapter 3 Gift Aid
- Fundraising Regulator – Code of Fundraising Practice, Fundraising communications and advertising (section 8)
