Fifty bespoke sales letters with finished mock-ups, posted by one person

Situation

Cold email to a German business is unlawful as a first contact, and a generic letter goes in the bin. The consultancy wanted to reach trade firms in Frankfurt and the surrounding towns that have no website or a broken one, and to do it with something the owner can hold: a letter about their own company with their own future website inside it. Done by hand, one such package is a day’s work. Fifty of them is a quarter.

Approach

We built the pipeline the way we build AI-native operations for clients: every step that a person used to do is a script or an agent, and the person keeps the decisions. A sourcing sweep finds firms with a missing or broken site and logs them in a register. A research agent writes a brief per firm from public sources, with a claims table that records where every statement came from. A writer agent drafts the German letter to the named owner, with one fixed price for one named scope, the lawful objection notice, and a QR code. An image model and a page generator build a three-screen mock-up of the firm’s own future site in its trade’s colours. A linter refuses any letter that breaks the house style, the legal wording, or a page break a person would not put there. A merge step assembles letter and mock-up into one print file per firm, and a print-and-post service prints, envelopes and posts the batch. Every quote page behind a QR code is reachable only with the letter, and no crawler can index it.

Every send is a founder action behind an explicit confirmation, because a posted letter cannot be recalled.

Result

On 18 September 2026 the first live batch went out: 50 letters in two runs, 21 at 09:25 and 29 at 10:15, to ten trades across fifteen towns, 24 of them in Frankfurt. Each letter carried a fixed price between €1,400 and €2,400 and its own mock-up. Postage for the whole batch was €89.50. The pipeline’s own campaign report records every recipient, price and quote page, and the register now measures replies against the direct-mail benchmark of about 3% to 5%.

The first batch stopped at 21 because of a reasoning error in the operator’s process rather than a limit in the tooling, and the campaign report says so. That is what the record is for.

What it cost

This was our own pipeline, built by the founder and run on our own systems. For a client, the same shape of work, one department’s repetitive process redesigned so that one or two AI agents do the production and the people keep the decisions, is the published AI-native operations price from €9,500, quoted as a fixed price before work starts and covered by our 100% money-back guarantee: full refund on request within 14 days of delivery. Postage, print services and AI subscriptions are third-party costs and sit outside the guarantee.

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