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How do I warm up a new email sending domain?

Start with 20 to 50 sends per day to your most-engaged recipients (people who opted in recently or replied recently). Double daily volume weekly until you reach your target send rate, typically over 3 to 6 weeks. Set up SPF, DKIM, and DMARC records before the first send. Sending high volume from a cold domain on day one will land your emails in spam permanently.

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