Individual skill
email-deliverability
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`).
skills/email-deliverability/SKILL.md
Source commit d9d6bb338f66cc1e23998585e580a0ea45bbcb82
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- Yes
- Observed behavior
- Network or broad shell
- Last checked
- Nov 6, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 533
- Repository last updated
- Nov 4, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agent-skills Repository topic
- agentic-ai Repository topic
- ai-agents Repository topic
- ai-coding Repository topic
- claude-code Repository topic
- cli Repository topic
- cline Repository topic
- codex Repository topic
- coding-assistant Repository topic
- cursor Repository topic
- email Declared skill tag
- deliverability Declared skill tag
- spf Declared skill tag
- dkim Declared skill tag
- dmarc Declared skill tag
- bimi Declared skill tag
- sender-reputation Declared skill tag
- bulk-sender Declared skill tag
- security Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
SKILL.mdcore · 9,087 bytesevals/README.mddoc · 1,345 bytesevals/cases.yamlasset · 4,499 bytesscripts/verify.shruns · 3,315 bytes
Read excerpt
# 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`.