Email Marketing Bible

Last verified Oct 29, 2026

Automate email audits, flow builds from a prompt, anti-slop copy and design, ESP ops via MCP with send gates, deliverability triage, and benchmarks by vertical.

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Read the full breakdownWho it is for, how it works, trade-offs, the quick start and the FAQ

who it's for

Who Email Marketing Bible is for#

Developers building AI-driven email pipelines

The skill provides account binding, pre-send compliance checks, segment validation, and approval gates that prevent a prompt from blasting a full list. It covers MCP connection patterns and the specific gates that keep agentic email operations safe in production.

Skip if:

Your only requirement is transactional emails triggered by app events. That is a webhook integration question, not an email marketing one, and the skill does not cover transactional infrastructure setup.

Marketers using Claude Code to run email

Install the skill and ask Claude to audit your Klaviyo account, build a win-back flow, or de-slop a campaign draft. The skill gives Claude the benchmarks, compliance rules, and copy protocols to do that work correctly rather than generically. The 19-vertical playbooks provide tactical specifics for your industry.

Skip if:

You are not running an AI agent for email work. The skill is a discipline layer for agents. Traditional email marketers working in an ESP dashboard with no agent integration get nothing from installing it.

Agencies configuring ESPs for multiple clients

The skill starts with an audit of the client's current setup, names the gaps, scaffolds what is missing, and runs a compliance check before any send. The 19-vertical playbooks let one agent adapt its approach for an ecommerce DTC client versus a SaaS B2B client without separate configuration.

Skip if:

Your agency work is campaign execution in a fixed ESP dashboard with no agent involvement. The skill is for agent-driven workflows; if your work does not involve running an AI agent, it adds nothing.

the problem

The problem it solves#

Marketers and developers running AI agents run into the same issue. The agent writes email marketing content that sounds plausible but is not grounded in anything current. Benchmark figures get invented, compliance rules are wrong or absent, and the copy reads like a template.

The underlying challenge is that email marketing has tight, regime-specific rules that change frequently. DMARC policy floors shifted with RFC 9989, Gmail Postmaster Tools moved to v2, and WhatsApp's free messaging lanes changed in October 2026. An agent without a current, sourced discipline layer produces wrong SPF configurations, outdated penalty figures, and send operations missing proper approval gates. Those errors appear in deliverability rates, compliance exposure, and copy that does not convert.

how Email Marketing Bible solves it

How it solves it#

Builds flows from a prompt

Welcome, cart, post-purchase, and win-back sequences scaffolded by the agent, with you reviewing exits, timing, and copy before anything goes live. The skill draws on its 908-source knowledge base to produce flow architecture grounded in what actually works by vertical, not on training data alone.

Audits your account and names the gaps

Reads your current setup and identifies what is missing in flows, segments, deliverability, and compliance. The output names specific gaps such as a missing SPF record, a welcome series without a cart trigger, or a non-compliant unsubscribe footer, rather than offering generic advice.

Drafts and de-slops copy in your voice

Writes with proven copywriting frameworks (PAS, AIDA, BAB) and runs an anti-slop pass before any copy leaves the agent. The de-slop step strips AI tells from the output so the result reads like a person, not a model. Google now filters high-similarity AI text, making this a deliverability concern as much as a quality one.

Step-by-step deliverability diagnosis

Covers SPF, DKIM, DMARC (updated for RFC 9989 and Gmail Postmaster Tools v2), BIMI, reputation, warming, and the AI-mediated inbox. Includes a switching-ESP runbook. The agent follows a structured triage path rather than offering generic advice, and the thresholds table is dated and sourced.

Runs your ESP over MCP with send gates

Operates any ESP an agent can reach through MCP or an API. A session-start routine binds to the correct account before drafting. Nothing sends to more than one person without an explicit instruction from you. Seed tests to up to five of your own addresses go without an extra confirmation step.

Industry benchmarks with sources and dates

Click, placed-order, and revenue-per-recipient figures by vertical and email type, each with its source and date. The skill covers 19 verticals from ecommerce DTC to financial services. Every figure traces to a named report or industry study, not to the model's training data.

strengths · trade-offs

Strengths and trade-offs#

Strengths

MIT license, zero infrastructureThe full skill pack is MIT licensed and installs as a file, with no server or subscription required. Claude Code users run two plugin commands; Codex and Cursor users run `npx skills add CosmoBlk/email-marketing-bible`. The knowledge base stays in your agent's context, not in a third-party service.
908 sources with evidence labels and datesEvery benchmark, threshold, and regulatory figure in the references carries a source, an evidence label, and a Last checked date. v2.8 adds a sweep of public work from July to October 2026. This matters for fields like GDPR erasure timing, the CAN-SPAM penalty ($53,088), and DMARC policy floors, where stale figures can create real liability.
19-vertical playbooksSeparate playbooks for ecommerce DTC, SaaS B2B and B2C, newsletter and creator, agency, nonprofit, healthcare, financial services, real estate, travel, education, professional services, retail, events, B2B manufacturing, restaurant, fitness, media, and marketplace. Each covers vertical-specific tactics, benchmarks, and flow patterns rather than generic category advice.
Hard send gates the agent cannot bypassThe skill encodes a permission ladder for connecting agents to ESPs. Anything to multiple recipients waits for an explicit instruction from you. Seed tests to your own addresses (up to five) go without a separate confirmation; any other send requires approval. The gates are skill instructions the agent follows, not advice it may choose to apply.

Trade-offs

-Requires a separate ESP to send emailThe skill is a knowledge layer, not an email service provider. You still need Klaviyo, Mailchimp, ActiveCampaign, Nitrosend, beehiiv, or another ESP to send. The skill tells the agent how to operate that ESP; it does not replace it. Teams that need an all-in-one AI-native email stack will need to configure one separately.
-Claude Code is the primary tested agentThe plugin manifest and two-command install are built for Claude Code. Codex and Cursor work via `npx skills add`; ChatGPT and Gemini require pointing at the raw SKILL.md, which loads fewer reference files automatically. The skill documents a fallback (fetching reference files from emailmarketingskill.com), but the Claude Code path has the most fully tested flow.
-88K-word knowledge base requires context budgetThe full skill is 88,000 words across 16 reference files. A short core file with the gates at the top loads first; reference files load on demand as tasks require them. In long sessions with heavy tool use, context compaction can cause reference files to drop. Very long multi-task sessions may need the agent re-bound to its account.

versus alternatives

Email Marketing Bible vs alternatives#

Email Marketing Bible vs Klaviyo

Klaviyo is the dominant paid email platform for ecommerce, with native AI copy drafting and flow suggestions inside its dashboard. Email Marketing Bible is not an email platform and does not replace Klaviyo directly. The comparison is what an external AI agent gains from using each.

Feature	Email Marketing Bible	Klaviyo
License	MIT, open source	Proprietary, subscription
Email sending	Requires separate ESP	Built in
Agent operations via MCP	Yes, any ESP	Dashboard AI only
Deliverability runbooks	908-source, updated Oct 2026	Platform-level guidance
Compliance coverage	6 regimes including EU AI Act	Compliance tools in platform
Vertical playbooks	19 industries	None

Klaviyo is the right choice for teams working in its dashboard who want AI assistance inside it. Email Marketing Bible is the right choice when you are running an AI agent that needs to operate Klaviyo (or any other ESP) with sourced best practices, send safety gates, and copy quality rules it can follow.

Email Marketing Bible vs Mailchimp and ActiveCampaign

Mailchimp and ActiveCampaign are general-purpose email platforms with built-in AI features. Both are optimized for their own dashboards, not for external agent access. Neither gives an agent the depth of sourced knowledge the skill provides: 19-vertical playbooks, deliverability runbooks current to 2026, compliance rules for six legal regimes, and an anti-slop copy protocol that strips AI tells before send.

For teams not running AI agents, Mailchimp or ActiveCampaign's native AI is simpler and fully integrated. For teams running an AI agent that drives their ESP, the skill makes the agent meaningfully more capable on top of whichever platform they already use.

install · quick start

Quick start#

bash

Install via npx for Codex and Cursor, or clone the repo into your agent's skills folder.
```bash
npx skills add CosmoBlk/email-marketing-bible
git clone https://github.com/CosmoBlk/email-marketing-bible
```

frequently asked

FAQ#

Is Email Marketing Bible free to use?

Yes. It is MIT licensed and free to install and use. There is no paid tier, account requirement, or usage limit. The skill is a file you install into your AI agent; the only cost is the compute your agent uses when processing tasks.

Which AI agents does it work with?

Claude Code is the primary supported path, with a two-command plugin install. Codex, Cursor, and other agents that support skills can install it via npx skills add CosmoBlk/email-marketing-bible. ChatGPT and Gemini can use the core SKILL.md file directly by pointing the model at the raw GitHub URL.

Does this skill replace my email service provider?

No. The skill teaches your AI agent how to operate an ESP; it does not send email itself. You still need Klaviyo, Mailchimp, ActiveCampaign, Nitrosend, or another ESP to send. The skill tells the agent what to build, how to build it, what the compliance rules are, and how to run the ESP through MCP safely.

How current is the deliverability and compliance information?

Version 2.8.2, published 13 October 2026, includes updates for Gmail Postmaster Tools v2, RFC 9989 (DMARCbis), WhatsApp's free messaging lane changes from 1 October 2026, Washington CEMA, UK PECR, and EU AI Act Article 50. Every dated figure in the references carries a source and a Last checked date.

What is the difference between this and a prompt for email marketing?

A single prompt cannot carry 88,000 words of sourced benchmarks, 19 vertical playbooks, deliverability runbooks, compliance rules, and anti-slop copy protocols. The skill loads reference files as the task requires them, so the agent draws on the right depth of context for each specific task rather than relying on training data. It also enforces gates. The approval rules and send checks are encoded as skill instructions the agent follows, not advice it may choose to apply.

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Email Marketing Bible vs Klaviyo

Feature	Email Marketing Bible	Klaviyo
License	MIT, open source	Proprietary, subscription
Email sending	Requires separate ESP	Built in
Agent operations via MCP	Yes, any ESP	Dashboard AI only
Deliverability runbooks	908-source, updated Oct 2026	Platform-level guidance
Compliance coverage	6 regimes including EU AI Act	Compliance tools in platform
Vertical playbooks	19 industries	None

Who Email Marketing Bible is for#

Developers building AI-driven email pipelines

Skip if:

Marketers using Claude Code to run email

Skip if:

Agencies configuring ESPs for multiple clients

Skip if:

The problem it solves#

How it solves it#

Builds flows from a prompt

Audits your account and names the gaps

Drafts and de-slops copy in your voice

Step-by-step deliverability diagnosis

Runs your ESP over MCP with send gates

Industry benchmarks with sources and dates

Strengths and trade-offs#

Strengths

Trade-offs

Email Marketing Bible vs alternatives#

Email Marketing Bible vs Klaviyo

Email Marketing Bible vs Mailchimp and ActiveCampaign

Quick start#

FAQ#

Similar open-source tools#

Open source tools in these categories#

Marketing & Growth

AI & Machine Learning

LLMOps & AI Tooling

Find open source alternatives to paid software

Who Email Marketing Bible is for#

Developers building AI-driven email pipelines

Skip if:

Marketers using Claude Code to run email

Skip if:

Agencies configuring ESPs for multiple clients

Skip if:

The problem it solves#

How it solves it#

Builds flows from a prompt

Audits your account and names the gaps

Drafts and de-slops copy in your voice

Step-by-step deliverability diagnosis

Runs your ESP over MCP with send gates

Industry benchmarks with sources and dates

Strengths and trade-offs#

Strengths

Trade-offs

Email Marketing Bible vs alternatives#

Email Marketing Bible vs Klaviyo

Email Marketing Bible vs Mailchimp and ActiveCampaign

Quick start#

FAQ#

Similar open-source tools#

Open source tools in these categories#

Marketing & Growth

AI & Machine Learning

LLMOps & AI Tooling

Find open source alternatives to paid software