MCP

Social proof and credibility

TL;DR

  • Proof answers the question every cold email raises and few answer: why should I believe you?
  • Compress it. The BAR structure — Background, Action, Results — fits a case study into one sentence [1].
  • Proximity beats prestige. A company the reader recognizes as like them outperforms a famous name from a different world.

One sentence, three parts

The compression problem is that a case study is a page and you have a line. The BAR structure solves it by keeping only what carries the argument: the background (who, and why they are comparable), the action (what changed), and the result (what it produced) [1].

The published example runs: a company at a similar growth stage was sending templates that relied on clicking through; making the emails conversational quadrupled their reply rate [1]. Twenty-odd words, and it does the whole job — the reader can see themselves in the background, understand the change, and judge the result.

Write yours the same way and resist adding context. Every clause that is not background, action or result is dilution.

Proximity beats prestige

The instinct is to lead with the biggest logo. Usually wrong: a large enterprise name tells a twenty-person company nothing about whether this works at twenty people, and can actively signal "not for you" on price.

Rank your proof by how close it is to the reader — same size, same sector, same problem, same stage. Where you have a genuinely famous customer and a comparable one, the comparable one goes in the email and the famous one goes in the signature or the follow-up.

This is a segmentation problem as much as a copy one: proof selected per segment is one of the highest-value uses of segment structure (Segmentation and tiering).

Forms of proof, roughly by strength

A comparable customer's result — strongest, when the number is specific and the company is recognizable as similar.

A number from your own data — a benchmark across your customer base. Works even without naming anyone, and doubles as a one-to-many offer (Offer design).

Something they can check — published research, a public teardown, a tool that works before they talk to you. Verifiable proof is the only kind that survives a sceptical reader.

Relevant experience — you have done this in their world before. Weak alone, useful as a qualifier.

Borrowed authority — investors, partners, press. Weakest, because it says nothing about whether the product works.

Credibility is also what you do not do

Proof is undone by the things around it. Numbers without a source read as invented. Vague superlatives ("dramatically improved", "industry-leading") subtract credibility because they are what someone writes when they have no number. Claiming a customer relationship that is really a trial is the kind of thing that gets checked and remembered.

The honesty norms in Subject lines apply to proof too: anything that would embarrass you if the recipient forwarded it to the customer you named should not be in the email.

When you have no proof

New product, no customers, no data. Say so and substitute something else: your own research, a demonstrable understanding of their problem, or a smaller ask that does not require belief — a question rather than a claim (Value proposition). Manufactured proof is the one option that is worse than none.

References

  1. Lavender — Case studies in cold emails (blog, Jan 2023)