A brand-new domain has zero sending reputation. Mailbox providers watch new senders closely: sudden volume spikes look exactly like spam. Warmup is the process of gradually building trust — small volumes, real engagement, consistent patterns.
Week 1: Foundation (10–20 emails/day)
Send only to people you know will engage — colleagues, friends, existing customers. Ask them to reply, not just open. Replies are the strongest positive signal you can generate. Keep every email personal and plain-text.
Week 2: Ramp (20–40 emails/day)
Double the volume but keep engagement high. This is a good time to start an automated warmup tool, which exchanges emails with a network of real inboxes that open, reply, and rescue your emails from spam automatically.
Week 3: First Campaigns (40–80 emails/day)
Begin small, highly-targeted cold campaigns — 30 to 50 prospects per day, max. Watch your open rates and spam complaints like a hawk. If opens dip below 40%, pause and let the domain rest for two days.
The Golden Rule
Never increase daily volume by more than 2x in a single week. Reputation builds slowly and collapses fast — one reckless blast can set you back to week one.
Week 4+: Scale With Guardrails
Once you are consistently above 50% opens with near-zero bounces, you can scale toward 100–200 emails per day per inbox. For bigger volume, add more inboxes or secondary domains rather than pushing one domain harder.
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