email-deliverabilitylisted
Install: claude install-skill SkillMedev/lifecycle-marketing
# Email Deliverability
Sender reputation takes months to build and days to destroy, and most teams discover a deliverability problem only after open rates have already cratered. This skill audits and protects inbox placement for permissioned marketing and lifecycle email - authentication, warmup, list hygiene, and engagement - and returns a scored audit with fixes in dependency order. It exists to catch the silent killers (an unenforced DMARC policy, a stale segment, a skipped warmup) before an inbox provider does.
## Operating procedure
Work the steps in order: authentication failures poison every downstream metric, so fix identity before hygiene, and hygiene before engagement.
### Step 1: Gather inputs
Collect these before auditing anything. If a number is estimated, label it a guess and verify against the ESP dashboard before the audit ships.
- Sending domain(s), and whether marketing and transactional mail share one identity.
- ESP(s) in use; shared or dedicated sending IP.
- List size, acquisition sources (signup form, import, purchase - a purchased source is an automatic red flag), and list age.
- Last 30 days of: delivered volume, hard and soft bounce rates, spam complaint rate, open and click rates by segment.
- Google Postmaster Tools access. If the domain is not enrolled, enrolling is the first remediation item - it is the only direct view of how Gmail scores the domain.
- DMARC report destination, if one exists.
### Step 2: Verify authentication by DNS looku