Cold Email Domain Calculator
Enter your target daily volume and sending preferences. We'll calculate exactly how many domains and mailboxes you need.
Your Domain Infrastructure
Active domains
4
Resting domains
2
Warm-up domains
1
Total domains
7
Total mailboxes
8
Sends per mailbox
63
Monthly Cost Estimate
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Automate with Sales.co →How This Calculator Works
The calculator divides your target daily volume by the per-mailbox limit (based on your risk tolerance) to determine total mailboxes needed. It then divides by mailboxes-per-domain to get the active domain count. If rotation reserve is included, it adds resting domains (40% of active count) and warm-up domains (20% of active count) for seamless rotation.
The standard recommendation is 2–3 mailboxes per domain sending 50–75 emails per day each. This keeps each domain well within safe sending limits while maximizing infrastructure efficiency.