How to set up inbox rotation for cold outreach campaigns?
Inbox rotation splits your outbound volume across multiple sending addresses so no single mailbox hits spam thresholds. In OnyxSend, add two or more warmed inboxes to a campaign, set a daily send cap per inbox (50 to 100 emails recommended), and the platform distributes sequences automatically. Replies route back to the originating address. Running three to five rotated inboxes lets you safely contact 150 to 500 prospects per day while keeping deliverability healthy and reply rates above baseline.
Evidence and detail
- Distributing sends across 3+ inboxes reduces per-domain sending density, lowering spam filter triggers by up to 60%.
- Campaigns with inbox rotation consistently see 15 to 25% higher reply rates versus single-mailbox sends at equivalent volume.
- OnyxSend automatically maps replies to the originating inbox, keeping conversation threads clean and meeting booking workflows intact.
Related reading
- /blog/cold-email-deliverability-guide
- /blog/how-to-warm-up-a-new-sending-domain
- /blog/scaling-cold-outreach-without-burning-domains
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