Email Deliverability Audit
growthenginenowoslawski/coldoutboundskills
Diagnostic audit for a running cold email program. An agent skill from growthenginenowoslawski/coldoutboundskills.
Email has the highest ROI of any marketing channel. An agent skill from davila7/claude-code-templates.
Install Email Systems
$ npx skills add davila7/claude-code-templates --skill email-systems -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install davila7/claude-code-templates email-systems --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/davila7/claude-code-templates.git skills-src && mkdir -p .claude/skills && cp -r skills-src/cli-tool/components/skills/business-marketing/email-systems .claude/skills/email-systems && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "email-systems" agent skill from https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/business-marketing/email-systems into .claude/skills/email-systems/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-systems", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/business-marketing/email-systemsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add davila7/claude-code-templates --skill email-systems -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install davila7/claude-code-templates email-systems --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davila7/claude-code-templates.git skills-src && mkdir -p .agents/skills && cp -r skills-src/cli-tool/components/skills/business-marketing/email-systems .agents/skills/email-systems && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "email-systems" agent skill from https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/business-marketing/email-systems into .agents/skills/email-systems/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-systems", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add davila7/claude-code-templates --skill email-systems -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install davila7/claude-code-templates email-systems --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davila7/claude-code-templates.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/cli-tool/components/skills/business-marketing/email-systems .cursor/skills/email-systems && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "email-systems" agent skill from https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/business-marketing/email-systems into .cursor/skills/email-systems/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-systems", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/davila7/claude-code-templates.git --path cli-tool/components/skills/business-marketing/email-systems--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add davila7/claude-code-templates --skill email-systems -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install davila7/claude-code-templates email-systems --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davila7/claude-code-templates.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/cli-tool/components/skills/business-marketing/email-systems .gemini/skills/email-systems && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "email-systems" agent skill from https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/business-marketing/email-systems into .gemini/skills/email-systems/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-systems", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install davila7/claude-code-templates email-systemsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add davila7/claude-code-templates --skill email-systems -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/davila7/claude-code-templates.git skills-src && mkdir -p .github/skills && cp -r skills-src/cli-tool/components/skills/business-marketing/email-systems .github/skills/email-systems && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "email-systems" agent skill from https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/business-marketing/email-systems into .github/skills/email-systems/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-systems", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add davila7/claude-code-templates --skill email-systems -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install davila7/claude-code-templates email-systems --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/davila7/claude-code-templates.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/cli-tool/components/skills/business-marketing/email-systems .opencode/skills/email-systems && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "email-systems" agent skill from https://github.com/davila7/claude-code-templates/tree/main/cli-tool/components/skills/business-marketing/email-systems into .opencode/skills/email-systems/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "email-systems", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
email-systems- GitHub stars
- 32k
- Used in
- 2 other repos
- Token cost
- ~548 tokens
- SKILL.md length
- 213 words
- Files
- 1
- Skills in repo
- 478
- Repo updated
- First seen
- Licence
- MIT
At a glance
Email has the highest ROI of any marketing channel. An agent skill from davila7/claude-code-templates.
- Tasks that involve Transactional email
- SKILL.md covers Patterns, Anti-Patterns and ⚠️ Sharp Edges
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
- Tasks that involve Email management
What it does
Email Systems is an agent skill from davila7/claude-code-templates. Email has the highest ROI of any marketing channel. $36 for every $1 spent. Yet most startups treat it as an afterthought - bulk blasts, no personalization, landing in spam folders. This skill covers transactional email that works, marketing automation that converts, deliverability that reaches inboxes, and the infrastructure decisions that scale. Use when: keywords, filepatterns, codepatterns.
Its SKILL.md is about 550 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Backend & APIs, covering Transactional email and Email management. The repository describes itself as: CLI tool for configuring and monitoring Claude Code. The licence is MIT.
When your agent uses it
- Tasks that involve Transactional email
- Tasks that involve Email management
Example prompts
- “/email-systems”
What it can do on your machine
Read from SKILL.md and the folder at commit 46b4d8b. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Email Systems loads about 548 tokens when it runs. Until then it costs about 104 tokens; SKILL.md has 213 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from davila7/claude-code-templates at commit 46b4d8b, republished under its MIT licence (© davila7). 213 words, ~548 tokens.
Download SKILL.mdSave it as
.claude/skills/email-systems/SKILL.md (or your agent's skills folder).- name
- email-systems
- description
- Email has the highest ROI of any marketing channel. $36 for every $1 spent. Yet most startups treat it as an afterthought - bulk blasts, no personalization, landing in spam folders. This skill covers transactional email that works, marketing automation that converts, deliverability that reaches inboxes, and the infrastructure decisions that scale. Use when: keywords, file_patterns, code_patterns.
- source
- vibeship-spawner-skills (Apache 2.0)
Email Systems
You are an email systems engineer who has maintained 99.9% deliverability across millions of emails. You've debugged SPF/DKIM/DMARC, dealt with blacklists, and optimized for inbox placement. You know that email is the highest ROI channel when done right, and a spam folder nightmare when done wrong. You treat deliverability as infrastructure, not an afterthought.
Patterns
Transactional Email Queue
Queue all transactional emails with retry logic and monitoring
Email Event Tracking
Track delivery, opens, clicks, bounces, and complaints
Template Versioning
Version email templates for rollback and A/B testing
Anti-Patterns
❌ HTML email soup
Why bad: Email clients render differently. Outlook breaks everything.
❌ No plain text fallback
Why bad: Some clients strip HTML. Accessibility issues. Spam signal.
❌ Huge image emails
Why bad: Images blocked by default. Spam trigger. Slow loading.
⚠️ Sharp Edges
| Issue | Severity | Solution |
|---|---|---|
| Missing SPF, DKIM, or DMARC records | critical | # Required DNS records: |
| Using shared IP for transactional email | high | # Transactional email strategy: |
| Not processing bounce notifications | high | # Bounce handling requirements: |
| Missing or hidden unsubscribe link | critical | # Unsubscribe requirements: |
| Sending HTML without plain text alternative | medium | # Always send multipart: |
| Sending high volume from new IP immediately | high | # IP warm-up schedule: |
| Emailing people who did not opt in | critical | # Permission requirements: |
| Emails that are mostly or entirely images | medium | # Balance images and text: |
© davila7, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in cli-tool/components/skills/business-marketing/email-systems of davila7/claude-code-templates.
Open the folder on GitHubat commit 46b4d8b
Used in 2 other repositories
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in davila7/claude-code-templates, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Email Systems next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Email Systems this skilldavila7/claude-code-templates | 32k | 2 repos | ~548 | Automated safety check: Pass | MIT | |
| Email Deliverability Auditgrowthenginenowoslawski/coldoutboundskills | 751 | — | ~3.4k | Automated safety check: Pass | MIT | |
| Himalaya Email CLIPrismer-AI/PrismerCloud | 1.6k | 2 repos | ~2.3k | Automated safety check: Pass | MIT | |
| Deliverability QAaaron-he-zhu/aaron-marketing-skills | 2.9k | 2 repos | ~3.6k | Automated safety check: Pass | Apache-2.0 | |
| Autopilottokencanopy/e2a | 193 | — | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Smtp Email Senderopenakita/openakita | 2k | — | ~693 | Automated safety check: Notes | AGPL-3.0 |
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A skill your agent uses when the user asks to "run a deliverability pre-flight before I send", "check my SPF/DKIM/DMARC/BIMI", "why am I landing in spam / promotions", or "score my sender reputation…
Autopilot
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Conversationally configure and operate a policy-first, always-on local e2a email agent.
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AgriciDaniel/claude-email
Audits email domain deliverability setup (SPF, DKIM, DMARC, MX records, blacklists, TLS) and generates health score (0-100) with prioritized fix list.
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Related
Categories
Questions about Email Systems
What does Email Systems do?
Email has the highest ROI of any marketing channel. An agent skill from davila7/claude-code-templates. Email Systems is an agent skill from davila7/claude-code-templates. Email has the highest ROI of any marketing channel.
When should I use Email Systems?
Email Systems fits situations like: tasks that involve Transactional email; tasks that involve Email management.
How do I install Email Systems in Claude Code?
Run `npx skills add davila7/claude-code-templates --skill email-systems -a claude-code`. Or copy the skill folder (cli-tool/components/skills/business-marketing/email-systems in davila7/claude-code-templates) into .claude/skills/email-systems in your project. Claude Code loads it when a task matches its description.
How do I install Email Systems in Codex?
Run `npx skills add davila7/claude-code-templates --skill email-systems -a codex`. Or copy the skill folder (cli-tool/components/skills/business-marketing/email-systems in davila7/claude-code-templates) into .agents/skills/email-systems in your project. Codex loads it when a task matches its description.
Can I use Email Systems in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add davila7/claude-code-templates --skill email-systems -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/email-systems, .gemini/skills/email-systems, .github/skills/email-systems and .opencode/skills/email-systems in your project.
What does Email Systems need to run?
SKILL.md names no scripts, command-line tools or credentials: Email Systems is instructions for the agent only.
Does Email Systems access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Email Systems safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Email Systems use?
Email Systems is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Email Systems use?
About 548 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Email Systems?
Skills that share tags, products or a category with Email Systems: Email Deliverability Audit (growthenginenowoslawski/coldoutboundskills, 751 stars), Himalaya Email CLI (Prismer-AI/PrismerCloud, 1.6k stars), Deliverability QA (aaron-he-zhu/aaron-marketing-skills, 2.9k stars) and Autopilot (tokencanopy/e2a, 193 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Email Systems?
davila7 (a GitHub user) maintains it in davila7/claude-code-templates, which has 32,483 GitHub stars. The repository holds 478 skills in this directory. The repository was last updated on October 9, 2026.
Source: davila7/claude-code-templates on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.