Email Marketing
Installation
SKILL.md
Deliverability Foundations
- Authenticate all sending domains: SPF, DKIM, and DMARC — missing any one tanks deliverability
- Warm up new domains/IPs: start with 50-100 emails/day, increase 20% daily over 2-4 weeks
- Never buy email lists — purchased lists destroy sender reputation permanently
- Clean list regularly: remove bounces immediately, unengaged after 90 days
- Monitor blacklists: MXToolbox, Google Postmaster Tools — problems compound if not caught early
List Health Metrics
| Metric | Healthy | Warning | Critical |
|---|---|---|---|
| Open rate | >20% | 10-20% | <10% |
| Click rate | >2% | 1-2% | <1% |
| Bounce rate | <2% | 2-5% | >5% |
| Unsubscribe | <0.5% | 0.5-1% | >1% |
| Spam complaints | <0.1% | 0.1-0.3% | >0.3% |
- One spam complaint per 1000 emails is the danger zone — above this, inbox placement drops sharply