Free tool
Cold Email Inbox Calculator
Google “allows” 2,000 emails a day per inbox. Send that cold and you're in spam by Friday. The safe number is ~25 cold sends per inbox per day. Enter your target volume and we'll show you how many inboxes and domains you actually need — and what it costs to run.
500
Net new cold sends per day across all inboxes. Follow-ups count too.
25
2026 safe limit is ~25, not Google's 2,000 technical cap. Higher = more risk.
3
Spread inboxes across domains so no single domain over-sends. 2–3 is typical.
Your sending setup
20
inboxes needed
7
sending domains (never your primary)
~$107
/mo infrastructure (inboxes + warmup + domains)
Plus a 3-week warmup before any inbox sends cold, SPF/DKIM/DMARC on every domain, and complaint rates kept under 0.3%. We set this up and run it for you.
Have us run the outbound — book a 15-min intro