# Cold Email — Marketing Skill for AI Agents

A cold email gets replies when it reads like a note from a sharp peer, not a pitch. The winning shape: a short, internal-looking subject line (2–4 lowercase words), an opener tied to the prospect's actual problem, one concrete proof point instead of a feature list, and a single low-friction ask. Then 3–5 follow-ups, each adding a new angle — 55% of replies come from the follow-ups, not the first send.

> Maintained by Corey Haines · v2.0.0 · Updated 2026-05-26

Install: `npx skills add coreyhaines31/marketingskills`
Source: https://github.com/coreyhaines31/marketingskills/tree/main/skills/cold-email

## When to use it

- "cold outreach,"
- "prospecting email,"
- "outbound email,"
- "email to leads,"
- "reach out to prospects,"
- "sales email,"
- "follow-up email sequence,"
- "nobody's replying to my emails,"

## What's inside

**The playbook covers:** Writing Principles, Voice & Tone, Structure, Subject Lines, Follow-Up Sequences, Quality Check, What to Avoid

### Reference library

- [Benchmarks, Data & Expert Methods](https://github.com/coreyhaines31/marketingskills/blob/main/skills/cold-email/references/benchmarks.md) — | Metric                     | Average | Good   | Excellent | Source                   |
- [Follow-Up Sequences](https://github.com/coreyhaines31/marketingskills/blob/main/skills/cold-email/references/follow-up-sequences.md) — 55% of replies come from follow-ups, not the initial email. Yet 48% of salespeople never follow up even once.
- [Cold Email Copywriting Frameworks](https://github.com/coreyhaines31/marketingskills/blob/main/skills/cold-email/references/frameworks.md) — Frameworks beat templates — they teach thinking patterns, not copy-paste shortcuts.
- [Personalization at Scale](https://github.com/coreyhaines31/marketingskills/blob/main/skills/cold-email/references/personalization.md) — Personalization drives 50–250% more replies (Lavender). The key insight: if your personalization has nothing to do with the problem you solve, it's just an attention hack (Clay).
- [Subject Line Optimization](https://github.com/coreyhaines31/marketingskills/blob/main/skills/cold-email/references/subject-lines.md) — The subject line determines whether the email gets read. The data is counterintuitive: short, boring, internal-looking subject lines win decisively.

## Key data

- Highest single-email reply rate: 8.4% (Belkins)
- 4–7 email campaigns achieve 27% reply rates vs 9% for 1–3 emails (Woodpecker, 20M emails)
- By 4th follow-up, response rates drop 55% and spam complaints triple.
- 1-2-3 Format** (reduces friction to near zero):
- "I never heard back" → 12% drop in meeting booking rate (Gong)
- Step 1:** Build a research stack of top 10 buying signals — 5 company triggers, 5 person triggers. Stack-rank by relevance.

## Example

**Prompt:** Write a cold email to VP of Marketing at mid-size B2B SaaS companies. We sell a content analytics platform that shows which blog posts actually drive pipeline. Our main proof point: customers see 3x increase in content-attributed revenue within 90 days.

**First touch · Subject: content attribution**

Hi Jordan — most marketing teams can tell you which posts get traffic, but not which ones actually touch pipeline. Usually means budget keeps flowing to content that looks busy but never closes.

We built Coefficient to map blog posts to revenue, not just sessions. Segment used it to find the 6 posts driving most of their pipeline and 3x'd content-attributed revenue in a quarter.

Worth a look at which of your posts are pulling their weight?

**Follow-up · Subject: re: content attribution**

One more thought — teams that get the most out of this usually start by auditing last quarter's top-converting posts, not their top-traffic ones. They're rarely the same list.

Happy to run that audit on your blog and send it over — no call needed. Want me to?

## FAQ

### What makes a good cold email subject line?

Short, boring, and internal-looking — 2 to 4 lowercase words with no punctuation tricks, emojis, or the prospect's first name. 2-word subject lines get roughly 60% more opens than 5-word ones. The subject line's only job is to get the email opened, not to sell.

### How long should a cold email be?

Ruthlessly short. Every sentence must move the reader toward replying — if a sentence doesn't earn its place, cut it. The best cold emails lead with the reader's world ('you/your') rather than the sender's, and feel like they could have been shorter, not longer.

### How many follow-ups should a cold email sequence have?

Three to five total emails with increasing gaps. 55% of replies come from follow-ups, not the first email — yet each one must add something new (a fresh angle, new proof, a useful resource), never 'just checking in.' Cap at four follow-ups; response rates drop sharply after that.

## Related skills

- **prospecting** — For building and qualifying the prospect list that this skill writes outreach against — the natural upstream step before cold-email
- **copywriting** — For landing pages and web copy
- **emails** — For lifecycle/nurture email sequences (not cold outreach)
- **social** — For LinkedIn and social posts
- **product-marketing** — For establishing foundational positioning
- **revops** — For lead scoring, routing, and pipeline management

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Canonical: https://marketing-skills.com/skills/cold-email