email-warmup-strategy
Installation
SKILL.md
Email Warmup Strategy
Email warmup is the process of gradually building sending reputation on a new domain or inbox by starting with low-volume, high-engagement email and slowly increasing volume over 2-4 weeks. A new domain with no sending history that blasts 200 cold emails on Day 1 will land in spam. A domain that sends 5 emails on Day 1, 10 on Day 5, 20 on Day 10, and 50 on Day 20 builds a reputation as a legitimate sender.
The principle: mail providers (Google, Microsoft, Yahoo) judge your domain's reputation based on sending patterns, engagement rates, and complaint rates. Warmup teaches these providers that your domain sends legitimate email that recipients want. Skip warmup and you teach them the opposite.
When Warmup Is Required
| Scenario | Warmup needed? | Duration |
|---|---|---|
| Brand new domain (just registered) | Yes, mandatory | 3-4 weeks minimum |
| New subdomain on existing domain | Yes | 2-3 weeks |
| New inbox on existing warmed domain | Yes (lighter) | 1-2 weeks |
| Existing domain, no cold email history | Yes | 2-3 weeks |
| Existing domain, paused cold email for 60+ days | Yes (re-warmup) | 1-2 weeks |
| Existing domain, sending consistently | No | Maintain sending volume. Don't spike |
| Switched email provider (Google → Microsoft) | Partial | 1 week. The domain has history but the IP is new |