01
The lapsed-customer note that does not offer anything
Trigger: Someone who bought and then stopped.
A short letter asking whether everything was alright last time, with no discount attached. The absence of an offer is what makes it credible — a voucher says "we want you back for the money", a question says "we noticed you were gone".
02
The letter to the people who nearly bought
Trigger: Quotes, appraisals and proposals that went quiet.
Six weeks after the silence, a note that explicitly releases them: "if you have decided against it, that is a perfectly good outcome". Counter-intuitively this is the highest-converting letter most businesses can send.
03
The thank-you nobody sends
Trigger: A completed job, a large order, a settlement, a renewal.
Written after the money has moved, when there is nothing left to sell. The only letter on this list with no commercial ask at all, and the one most likely to produce a referral eighteen months later.
04
The neighbours letter
Trigger: You just did work in a street — sold a house, installed a system, landscaped a garden.
Twenty handwritten notes to the surrounding properties beat a thousand printed flyers, because they can see the evidence from their front window.
05
The referral acknowledgement
Trigger: Someone sent you work.
Within a week, from the person who received it, by name. This is the highest-return correspondence in professional services and most firms manage an email at best.
06
The renewal defence
Trigger: A policy, rate, contract or membership expiring in ninety days.
Written before the competitors get there, naming the date, and honest that they have options. It is cheap relative to the value of the account being defended.
07
The apology
Trigger: Something went wrong.
A written apology is one of the few gestures that cannot be produced cheaply, which is exactly why it works. Send it before they escalate, not after.
08
The anniversary
Trigger: A year since they joined, bought, moved in or started.
Trivially easy to trigger from any database with a date in it. Almost nobody does it, which is what makes it land.
09
The invitation that is not an email
Trigger: An event, briefing or opening.
A written invitation reads as selective, which is usually what the event is trying to signal in the first place.
10
The first-order card in the parcel
Trigger: A customer orders for the first time.
No postage, no addressing — the cards go to your warehouse in batches and get packed with qualifying orders. Restrict it to orders worth the card.
11
The dormant-account letter with a deadline attached
Trigger: Accounts inactive for a defined period, where inactivity has a consequence.
A genuine deadline — an expiring credit, a closing account, a changing rate — gives the letter a reason to be read now. Do not invent one; readers can tell.
12
The introduction from a named person
Trigger: A new adviser, agent, account manager or partner taking over a relationship.
A handover email gets deleted. A written note from the person taking over sets the register for the whole relationship, and it is the cheapest retention spend at the moment when clients are most likely to leave.
What the good ones have in common
- A trigger, not a schedule. Something happened that made this the right week to write. “Quarterly newsletter” is not a trigger.
- A finite list. If you cannot name the criterion in one sentence, the list is too broad.
- One ask, or none. Several of the best have no ask at all.
- A named human sender. Not a department, not the company.
- Something only the recipient knows. Which fields to merge.
Two things to avoid
The whole-database mailout. At three or four dollars a piece, mailing everyone is not a strategy, it is an absence of one — and it produces the worst possible evidence about whether the channel works for you.
The discount reflex. Attaching an offer to a handwritten letter converts it back into advertising in the reader’s mind and throws away the advantage you paid for. Several of the ideas above work specifically because there is no offer in them.
Worked examples with actual copy, and what each of these would cost.