Calculator
How many inboxes do you actually need — active, backup, and in warmup — based on your daily send target.
Your setup
Your inbox count
Estimated monthly cost
$126 – $315
Based on $6–15/inbox/month
Rule of thumb: Max 3 inboxes per domain. Keep at least 25% of your active pool as pre-warmed backup. If you need inboxes ready without a warmup period, WarmInboxes provides pre-warmed inboxes you can deploy same-day.