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The Complete Cold Email Domain Warmup Guide: DNS, SPF, DKIM, DMARC Setup
Step-by-step infrastructure guide — from fresh domain to 50 emails/day safely. Configure SPF, DKIM, DMARC and run the warmup schedule that works.
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How Many Sending Domains Do You Actually Need? (The Math)
The answer isn't 'two or three'. It's a formula. Here's the exact calculation: emails per inbox, inboxes per domain, safety margin — plus a reference table for your target volume.