# Email Deliverability

> Diagnose, audit, and fix email deliverability problems using a proven, systematic methodology. Use this skill whenever someone asks for a deliverability audit, says "audit my email", "check my deliverability", "why are we hitting spam", or "why are my emails going to spam" — or mentions inbox placement problems, emails going to spam, low open rates, IP/domain reputation damage, blocklisting, warming up IPs or domains, shared pool contamination, bounce rate spikes, mailbox provider blocks, sender reputation, or email authentication failures. Also trigger when someone is setting up email sending for the first time and wants to get it right, wants a review of their email setup, or asks about ESP infrastructure health, sender compliance, list hygiene, traffic shaping, or reputation recovery planning. Even if they just say "our emails aren't working" or "open rates dropped" — this is the skill to use.

## Facts
- Page: https://tashan.sh/capability/skill-sendx-email-deliverability
- tashan id: skill:sendx/email-deliverability
- Source: https://github.com/sendx/email-skills
- Type: skill
- Category: other
- tashan score: not scored (catalogued only — too little public evidence)
- Adoption: 9.0
- Upkeep: 78.0
- Freshness: 91.0
- Evidence coverage: 84% of the inputs this score can use
- Health: active
- Instruction depth: not yet graded
- License: MIT
- Official: no

## Install

```sh
cp -r email-deliverability ~/.claude/skills/
```

## Security audit
Not scanned. We audit npm-published capabilities; this one has no npm package we can resolve, or has not reached the queue. This is not a clean bill of health.

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Measured 2026-08-14 by tashan (https://tashan.sh) from public evidence. Scorer s5.