email-deliverability SKILL.md skillA
email-deliverability from ericrisco/rsc-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ericrisco/rsc-harness/email-deliverability@git:20260729.9b4d66aPins git:20260729.9b4d66a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ericrisco/rsc-harness
- Path
skills/email-deliverability/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260729.9b4d66a, committed Jul 29, 2026
- First version recorded
- Jun 2, 2026
- Size
- 9,087 bytes
- Repository stars
- 236
- License
- MIT
Use when mail already sent lands in spam, is rejected, or fails the Gmail/Yahoo bulk-sender checks and the fix is authentication and reputation, not the sending code: SPF/DKIM/DMARC alignment, domain warmup, spam-complaint rate, one-click unsubscribe, BIMI. NOT putting mail on the wire through a provider API (that is `email-connector`).
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 — make mail authenticate and land in the inbox This skill owns one layer: **why mail you already send gets filtered, deferred, or rejected, and the DNS + reputation work that fixes it.** It starts where the send technically succeeds but the message never reaches the inbox. The lever is almost never the sending code. It is three DNS records that must *align*, a complaint rate you must hold down, and a reputation you build slowly and lose fast. Treat this as ops on a domain, not a code change. ## Not this skill - **Sending the mail at all** — provider SDK, `sendEmail()` seam, templates, retries, batch caps, bounce/complaint webhooks → `../email-connector/SKILL.md`. That skill feeds the suppression list; this one explains the reputation it protects. - **Subject lines, open/click optimization, list growth** → `newsletter`. - **Outbound prospecting sequences, lead lists** → `cold-outreach` (deliverability is a *constraint* on it, not the same job). - **Consent, lawful basis, retention of the address list** → `gdpr-privacy` and `data-policy`. Unsubscribe *mechanics* live here; consent *law* does not. …
Read the whole file at its exact version.
How to install
mdr add ericrisco/rsc-harness/email-deliverability@sha256:cd108ba466a5a369The line at the top of this page pins the label git:20260729.9b4d66a, 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_m7bztxnnyd5xcn6q)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jun 2, 2026 and Jul 29, 2026, about one every 57 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260729.9b4d66a latest | 2026-07-29 | 9b4d66a | 9,087 B | A | view · diff |
| git:20260602.004e38d | 2026-06-02 | 004e38d | 10,763 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 (9087 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
ericrisco/rsc-harness · 236 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_m7bztxnnyd5xcn6q GET https://markdownregistry.com/api/v1/resolve?ref=ericrisco/rsc-harness/email-deliverability GET https://markdownregistry.com/api/v1/blob/cd108ba466a5a3697f5c323b130b9fe19d7c3bddc028eae3dff56306d8c7dca0
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.
More from ericrisco/rsc-harness
Every file in ericrisco/rsc-harness