# Monitor email list health

Email lists can lose engagement and develop deliverability problems between campaigns. This skill turns your ESP data into clear cohorts, trend checks, and an action worklist.

## Install

```bash
npx skillstore add aaron-he-zhu/list-hygiene-monitor
```

## Metadata

- Status: approved
- Slug: aaron-he-zhu-list-hygiene-monitor
- Version: 19.0.0
- Author version: 19.0.0
- Skillstore revision: r2
- Version status: valid
- Tree hash: bc53f037481207900324a84487fa379b11dff8c28deb123c0dad0b8a491f33d7
- Author: aaron-he-zhu
- GitHub username: aaron-he-zhu
- License: Apache-2.0
- Repository: https://github.com/aaron-he-zhu/aaron-marketing-skills/tree/main/email/setup/list-hygiene-monitor
- Ref: 0715a6e09ea875c8e28cb705ce87cc83045e69c1
- Supported tools: Claude, Codex, Claude Code
- Audit status: complete
- Agent install advisory: allowed
- Manual install advisory: allowed
- Artifact signature: available
- Audit attestation: unavailable
- Human verification: not\_verified
- Risk factors: filesystem, external\_commands, network
- Quality score: 77
- Quality tier: bronze
- Public page: https://skillstore.pages.dev/skills/aaron-he-zhu-list-hygiene-monitor
- Manifest: https://skillstore.pages.dev/api/skills/aaron-he-zhu-list-hygiene-monitor/manifest

## Capabilities

- Groups subscribers by 30, 90, 180, and 365-day engagement recency.
- Compares hard-bounce and spam-complaint rates with a prior baseline.
- Checks suppression-list growth and identifies potential opt-out leakage.
- Creates sized re-permission, sunset, and prune worklist segments.
- Labels conclusions as measured, estimated, or needing more input.
- Produces SEND list-hygiene and engagement-decay handoff reads.

## Use Cases

- Review a growing newsletter list: Identify dormant subscribers and prepare a measured sunset plan before deliverability declines.
- Investigate declining campaign engagement: Compare current bounce and complaint signals with an earlier export and prioritize follow-up actions.
- Maintain a recurring hygiene process: Create a monthly or quarterly worklist with documented baselines for a marketing operations team.

## Prompt Templates

### Start a basic list review

```
Review my email list health. I will provide an ESP engagement export and bounce report. Create cohorts and a simple action worklist.
```

### Compare with a baseline

```
Compare this month's engagement, hard-bounce, and complaint data with last quarter's baseline. Show the numeric changes and recommended actions.
```

### Check suppression drift

```
Review these active-list and suppression exports for growth, leakage, and subscribers who need re-permission, sunset, or pruning.
```

### Run a scheduled hygiene watch

```
Run a quarterly hygiene review for our newsletter profile. Use these exports and baseline, label evidence quality, produce SEND S and E reads, and state the next comparison date.
```

## Limitations

- It relies on ESP exports, prior baselines, or an optional compatible connector.
- It does not verify authentication settings or calculate a complete email quality score.
- It does not own consent records or make final compliance decisions.
- It cannot infer trend changes when no prior baseline is available.

## Best Practices

- Provide a dated ESP export and a prior baseline for every scheduled review.
- Keep opt-out and suppression records authoritative in the consent system.
- Confirm worklist changes before removing or suppressing subscribers.

## Anti Patterns

- Do not treat a point-in-time rate as a trend without a baseline.
- Do not re-mail complained or hard-bounced addresses through a re-permission campaign.
- Do not mark incomplete data as a passing hygiene result.

## Security Audit

- Audited at: 2026-07-27T11:22:23.379\+00:00
- Summary: Most static findings are false positives caused by Markdown links and code formatting. One instruction runs local ESP connector and ledger commands; it is legitimate functionality but should execute only with user confirmation and validated values.

## Stats

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