cmo-email-deliverability SKILL.md skillA
cmo-email-deliverability from ai-marketing-os-ltd/cmo-so-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ai-marketing-os-ltd/cmo-so-skills/cmo-email-deliverability@v0.15.0Pins v0.15.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ai-marketing-os-ltd/cmo-so-skills
- Path
plugins/cmo-so-email/skills/cmo-email-deliverability/SKILL.md- Versions recorded
- 5
- Latest version
- v0.15.0, committed Oct 25, 2026
- First version recorded
- Oct 19, 2026
- Size
- 12,082 bytes
- Repository stars
- 4
- License
- MIT
Check that opted-in marketing email reaches the inbox: authentication, unsubscribe headers, bounces and suppression, sender reputation and list hygiene, with fixes in order. Use when the user says things like "why are our emails going to spam?"; "check our SPF, DKIM and DMARC"; "we're about to send to the whole list, is it safe?"; "our click rates dropped suddenly"; "do we meet the Gmail and Yahoo bulk sender rules?"; "clean up our email list".
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Email deliverability Makes sure the email people asked for actually reaches their inbox. It checks the sending domain's authentication, the unsubscribe and bulk-sender basics, bounce and complaint handling, sender reputation, the next email's content risks and the health of the list, then orders the fixes so the user knows what to do before the next big send. It covers opted-in marketing email (newsletters, sequences, promotions); the copy itself belongs to `cmo-newsletter` and `cmo-email-sequences`. ## When to use - Before a first send, a send to the whole list, or a move to a new platform, domain or IP. - Emails landing in spam, a sudden drop in clicks, bounces or complaints rising. - "Check our SPF/DKIM/DMARC", "are we compliant with the bulk sender rules", "clean our list". - Designing the unsubscribe page, preference centre and suppression rules. Not for: cold outbound to people who never opted in, including its separate domains and mailbox warm-up (`cmo-cold-email`); writing issues (`cmo-newsletter`) or sequences (`cmo-email-sequences`); text messages (`cmo-sms-whatsapp`). ## Before you start …
Read the whole file at its exact version.
How to install
mdr add ai-marketing-os-ltd/cmo-so-skills/cmo-email-deliverability@sha256:af73ad0a1621c35cThe line at the top of this page pins the label v0.15.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_kgn3d7qgqx5cfrc2)
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Versions
The registry has recorded 5 versions of this file, between Oct 19, 2026 and Oct 25, 2026, about one every 2 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.15.0 latest | 2026-10-25 | e59889b | 12,082 B | A | view · diff |
| v0.14.0 | 2026-10-25 | 3938fc5 | 12,082 B | A | view · diff |
| v0.13.0 | 2026-10-22 | af514f0 | 12,082 B | A | view · diff |
| v0.11.7 | 2026-10-19 | f73e99e | 12,082 B | A | view · diff |
| v0.11.6 | 2026-10-19 | 4d1b95e | 12,082 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (12082 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ai-marketing-os-ltd/cmo-so-skills · 4 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_kgn3d7qgqx5cfrc2 GET https://markdownregistry.com/api/v1/resolve?ref=ai-marketing-os-ltd/cmo-so-skills/cmo-email-deliverability GET https://markdownregistry.com/api/v1/blob/af73ad0a1621c35c43f07e1cefb53149cfab2795f1190caf9e29a1fab5de5121
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.