Cold Email Domain Rotation: The Active/Resting/Warm-Up ...

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1. “Domains left in continuous service drop from 92% inbox placement in month 1 to 63% by month 10.” The recommendations here are based on deliverability data from the Sales.co platform, where we manage domain rotation for hundreds of outbound programs. This guide covers the three-tier system that keeps infrastructure healthy, the signals that tell you when to rotate, and the playbook for executing rotations without capacity gaps.

   In Domain and mailbox lifecycle

2. “Rotate each cold email sending domain out of active duty every 4–6 months, rest it for 4–6 weeks, and keep a total portfolio 1.6–2x the number of domains you actively send from.” The recommendations here are based on deliverability data from the Sales.co platform, where we manage domain rotation for hundreds of outbound programs. This guide covers the three-tier system that keeps infrastructure healthy, the signals that tell you when to rotate, and the playbook for executing rotations without capacity gaps.

   In Domain and mailbox lifecycle

3. Step 4: Move to rest. Once the retiring domain has zero active sequences, reduce it to warm-up-only traffic (5–10 emails/day) and maintain this for 4–6 weeks. During rest, continue monitoring its reputation via Google Postmaster Tools. You should see the reputation score stabilize and then begin recovering within 2–3 weeks. “If it has, move it back to the warm-up tier for a brief re-warm period (7–10 days) before returning to active duty.” Automation vs. Manual Rotation

   In Mailbox warm-up recovery