IP warm-up

Gradually ramping send volume on a new IP so receivers build reputation for it.

Published January 15, 2026 · By RAPID SMTP

Send 50 → 200 → 1,000 → 5,000 over the first 1–2 weeks. Skipping warm-up triggers spam folders. SES, Postmark and Mailgun document specific warm-up schedules.

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