2-minute read
Learn how email warmup works
Brand-new sending domains have zero reputation. If you blast 5,000 emails on day one, Gmail and Outlook will quietly bulk-folder you and burn your domain for 6–8 weeks. This 2-minute read turns that into a non-issue.
Why warmup is non-negotiable
Spam filters (Gmail, Outlook, Spamhaus) judge brand-new domains by behavior over time. Send too much, too fast, with low engagement and they assume you're a spammer — for weeks. Send slowly with good engagement and they trust you forever.
Your safe ramp schedule (per mailbox)
| Window | Daily cap | Goal |
|---|---|---|
| Day 1–3 | ~20 / day | Earn the first opens |
| Day 4–7 | ~50 / day | Open rate > 15% |
| Week 2 | ~100 / day | Bounce < 3% |
| Week 3 | ~250 / day | Replies coming in |
| Week 4+ | Full volume | Domain trusted |
Sellscape enforces this automatically
If you build a 2,000-recipient campaign on day one, the system refuses to blast it and offers to auto-pace it over 28 days. You can't accidentally burn your domain.