How many cold emails can you send per day safely?
In 2026, keep sends to 30 to 40 cold emails per inbox per day, warm up 2 to 4 weeks first, and rotate across 5 to 20 inboxes on secondary domains.
Google and Microsoft filters penalize high volume from a single inbox faster than ever.
Structure: buy 3 to 5 secondary domains, set up 3 to 5 inboxes each, warm every inbox 3 to 4 weeks, then send 30 to 40 cold emails per inbox per day.
That gives you 450 to 1,000 daily sends without cooking your primary domain.
Always sign SPF, DKIM, and DMARC on every sending domain.
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