Email Marketing Bible
CosmoBlk/email-marketing-bible
Email Marketing Bible is a free, MIT-licensed email marketing skill by George Hartley, co-founder of Nitrosend. It is a single SKILL.md in two parts: an operating manual for an agent that builds flows, writes copy, fixes deliverability and works with an email platform, and a reference of benchmarks, compliance rules and 19 industry playbooks. It installs with one git clone, ships no hooks or scripts, and tells the agent not to send to more than one recipient without explicit approval.
Facts checked on against the sources listed at the end of this page.
- GitHub stars
- 326
- Skills in the pack
- 1
- Agents supported
- 2plus any agent that reads the skill format
- License
- MIT
- Last commit
- 17 hours ago7 October 2026
- Instruction size
- 4.2k wordsacross its SKILL.md file
How to install Email Marketing Bible
| Agent | Command | Copy |
|---|---|---|
| Claude Code | The README gives this one command and says it works wherever you run skills: Claude Code, Claude Desktop and any agent that reads the skill format. |
Commands as given in the README on 7 October 2026.
What Email Marketing Bible runs on your machine
- Hooks
- No. The repo holds SKILL.md, README.md, LICENSE and .gitignore, with no hooks file.
- Bundled scripts
- No bundled scripts. The skill tells the agent to run one shell command, openssl rand -base64 48, to make a random seed string for its design method.
- Network calls
- Yes, by instruction only. The skill ships no code, but it directs the agent to work with your email platform through MCP servers or connectors, to fetch the served URL of a hero image to check it still animates, and to render quote tiles in headless Chrome.
- API keys needed
- None named. To work with an email platform, the agent uses whatever MCP connection or credentials you have set up for that platform.
- Tool permissions
- None. The SKILL.md frontmatter has no allowed-tools field.
These are facts read from the repo, not a security rating. Read the files before you install any skill.
What is inside Email Marketing Bible
| Skill or command | What it makes the agent do |
|---|---|
| Agent operating rules | Sets hard gates for any live email account: no send or schedule to more than one recipient without explicit approval in the conversation, a preview and send packet first, and a blocked send when authentication, unsubscribe or consent is missing. |
| AI email automation | Teaches a read, reason, act, verify loop, says what to automate and what to keep human, and recommends a recurring health digest to catch flows that quietly stop. |
| Field notes on running an ESP from an agent | Lists rules learned from running Nitrosend's own sending through agents, such as version checks on writes, asserting audience id and count before a send, and decoding tracking-wrapped links. |
| Pre-send checklist | A checklist of audience, suppressions, authentication, unsubscribe, copy, design, links, sender and a kill switch, to confirm before asking for a human go-ahead. |
| Anti-slop copy protocol | Filters AI-sounding email copy with a banned-word list, sentence-length variation and a rule to include one real opinion and one real number. |
| AI email design protocol | A Discover, Define, Deliver method: seed strings for variety, 12 to 20 direction one-liners, a separate critic model scoring screenshots, and output as MJML, React Email or Maizzle. |
| Core flow recipes | Trigger, wait, condition and send outlines for welcome, abandoned cart, post-purchase, win-back and other lifecycle flows, in build order. |
| Deliverability triage | A diagnosis path through SPF, DKIM, DMARC, reputation, bounce logs and content, with complaint-rate thresholds and warm-up schedules. |
| Compliance gates | Six questions to answer before any send, with a summary of CAN-SPAM, GDPR, CASL and the Australian Spam Act and the one-click unsubscribe rule. |
| Platform selection | A table of 14 email platforms by best use and by how an agent can drive them, with a disclosure that Nitrosend shares a founder with the guide. |
This is one skill, so the list shows the main sections of its SKILL.md. It also covers cold email, WhatsApp, SMS and RCS, benchmarks by industry and short playbooks for 19 verticals. The full 19-chapter guide is on the maker's website.
A good fit for
- Marketers and founders who run email through an AI agent and want written stops before anything sends
- Stores and SaaS teams that need to audit flows or work out why mail lands in spam
- Anyone choosing an email platform who also cares whether an agent can operate it
- Writers who want AI-sounding phrases removed from email drafts
Skip it if
- Readers who want a neutral platform ranking: the author co-founded Nitrosend, which is in the platform table, and the file says so
- People who need the full reference in the install, since the 19 chapters live on the maker's website and the installed skill is a condensed version
- Setups where the send gates must be enforced, because they are instructions to the agent and not a technical block
How Email Marketing Bible works
The skill treats every segment, draft, campaign and flow on a real email platform as live. Its first section sets the rules the agent follows: show a preview and a send packet with audience size, suppressions, subject, sender and unsubscribe status, then wait for an explicit go-ahead in the conversation. It names the cases where the agent should block a send, such as missing authentication or a complaint rate at or above 0.1%.
The rest is a working reference. Part A is the operating manual for building flows, copy, design and sends. Part B holds benchmarks, deliverability and compliance rules, cold email, messaging channels and the platform table. The maker says it is distilled from a 19-chapter guide with 908 sources, his earlier company SmartrMail and three months of running Nitrosend through agents. Those figures are the maker's own and the files do not let you check them.
- Made by
- George Hartley
- Topic
- Marketing and SEO
- Works with
- Claude Code, Claude Desktop
- Website
- emailmarketingskill.com
How much context Email Marketing Bible uses
| The skill | 4,151 words in its SKILL.md file |
|---|---|
| Loaded at start | Only each skill's name and description. The full text loads when a task needs that skill. |
Word counts are measured from the repo every day. Reference files a skill loads on demand are not counted.
Is Email Marketing Bible still maintained?
| Last commit | , 17 hours ago |
|---|---|
| Latest release | v1.0, 10 March 2026 |
| Stars gained in 7 days | Shown after 7 days of tracking |
| Stars gained in 30 days | Shown after 30 days of tracking |
| Open issues and pull requests | 1 |
| Forks | 39 |
Tools Email Marketing Bible works with
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Questions about Email Marketing Bible
Is Email Marketing Bible free?
Yes. It is open source under the MIT license, and the full guide it is based on is free to read on the maker's website.
How do I install Email Marketing Bible?
Run git clone https://github.com/CosmoBlk/email-marketing-bible.git ~/.claude/skills/email-marketing-bible. The README says it works in Claude Code, Claude Desktop and any agent that reads the skill format.
Will it send emails on its own?
The skill tells the agent not to send or schedule to more than one recipient without explicit approval in the conversation. That is a written rule for the agent, so it depends on the agent following it.
Who makes Email Marketing Bible?
George Hartley, co-founder of Nitrosend, who also ran SmartrMail. The skill lists Nitrosend in its platform table and states that it shares a founder with the guide.
Does it include code or hooks?
No. The repo contains the SKILL.md, a README, a license and a .gitignore. It has no hooks or scripts.
Sources
- CosmoBlk/email-marketing-bible on GitHub
- Email Marketing Bible README
- Email Marketing Bible SKILL.md
- Email Marketing Bible license
- The full Email Marketing Bible guide
Something wrong or out of date? Email [email protected] with a link to the source. Stats come from the public GitHub API and update every day.
For the maker
Add this badge to your README. The number updates every day.
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