How many mailboxes & domains do I need?
Sizing your infrastructure for a target sending volume.
Mailbox Infrastructure4 steps
- 01Plan ~20–30 cold emails/day per mailbox at steady state.
- 02Use 2–3 mailboxes per domain, never more.
- 03Example: 1,000 emails/day ≈ 40 mailboxes ≈ 14–20 domains.
- 04Add 20% spare capacity so you can rest domains that dip in health.
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