Email warmup, done right
Email warmup is the process of gradually increasing send volume from a new domain or IP while generating positive engagement, so mailbox providers learn to trust you. Skip it and your first real campaign from a cold domain lands in spam.
Why mailbox providers enforce this
Mailbox providers assign reputation to sending domains and IPs over time. A brand-new domain has none — and a sudden volume spike from an unknown sender is the single clearest spam signal there is. Warmup manufactures the early positive history (opens, replies, no complaints) that earns inbox placement before you send at scale.
How to fix it
- Authenticate first — SPF, DKIM, and an aligned DMARC policy. Warmup on an unauthenticated domain is wasted effort.
- Start with a handful of sends per day to engaged, real recipients, and ramp ~30-50% every few days.
- Generate genuine engagement — opens and especially replies — in the early weeks; automated warmup networks help but real conversation is best.
- Keep complaints near zero and never email unverified or purchased lists during warmup.
- Allow 2-4 weeks before sending at full volume; a new domain pushed hard early can be hard to recover.
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FAQ
How long does email warmup take?
Typically 2-4 weeks for a new domain to handle meaningful volume, longer for high-volume cold outreach. It's reputation-building, not a switch.
Do warmup tools actually work?
Automated warmup (inboxes auto-replying to each other) helps build baseline engagement, but providers increasingly discount obviously-artificial warmup traffic. Real recipient engagement matters more.
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