Multi-mailbox rotation for outbound teams

Distribute sequence load across mailboxes without burning reputation on a single inbox.

Why rotate mailboxes

One inbox sending hundreds of cold emails daily accumulates risk. Rotating across multiple authenticated mailboxes keeps per-inbox volume in a safer band and isolates reputation if one address hits a rough patch.

Assign campaigns to mailboxes

Each sequence should use a connected mailbox with matching From identity. Split audiences by region, segment, or owner so operators know who monitors replies.

Cap per mailbox, not just per domain

Domain-level authentication helps, but providers still score individual mailboxes. Track sent volume, bounces, and complaints per connected inbox.

Team operating model

Agencies often dedicate mailboxes per client or per SDR. Document which mailbox owns which suppression context so opt-outs do not leak across unrelated audiences.

Rotation pitfalls

• Same template blasted from ten inboxes on day one.
• Shared suppression list missing across mailboxes.
• Ignoring hourly deferrals from Microsoft or Google.
• Rotating without monitoring per-mailbox bounce rates.