warmup
Email warmup explained: ramping a new sending domain
A new domain has zero reputation. Warmup builds it gradually so receivers learn to trust you — before you send a single real campaign.
2026-06-12 · 5 min read
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Warmup is the process of gradually increasing send volume from a new domain and mailbox so receivers build trust in it. Skip it and your first real campaign looks exactly like a spam blast: a cold domain suddenly sending hundreds of messages.
Why it works
Receivers watch patterns. A domain that starts small, gets opens and replies, and ramps steadily reads as a real sender. Warmup manufactures that early positive history — ideally with real engagement, not just volume.
A simple ramp
- Pre-flight: set SPF, DKIM, DMARC and a custom tracking domain; let the domain age a couple of weeks.
- Week 1: ~10–20 emails/day to engaged, safe recipients.
- Weeks 2–4: roughly double each week, watching bounce and complaint rates.
- Throttle back immediately if spam complaints rise or reputation dips.
- Begin real campaigns only once volume and reputation are stable.
Want it handled end to end? That is the whole point of the managed pool — see pricing.
Want CogniLead running deliverability on every send? Try it free or read the docs.