How to Warm Up an Email: 6-Week Plan, No Tools - Tomba Blog

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1. DNS comes first. SPF, DKIM, and DMARC must be live and passing before day one of warmup, or you're building reputation on a broken foundation. “Warmup tools (Instantly, Warmup Inbox, Mailreach) automate the reciprocal-reply loop, but they only simulate engagement. Real replies from real prospects are what actually move the needle.” Google's bulk-sender rules require spam complaints stay under 0.30%, with 0.10% as the working target. Blowing past that once can undo six weeks of ramp.

   In Automated mailbox warm-up

2. TL;DR “Warming up an email account means building sender reputation gradually — start at 5-10 sends per day on a new mailbox and ramp roughly 30-50% per week until you hit your target volume. Most accounts need 4-6 weeks.” DNS comes first. SPF, DKIM, and DMARC must be live and passing before day one of warmup, or you're building reputation on a broken foundation.

   In Mailbox warm-up ramp schedules

3. Uniform send intervals. Exactly 120 seconds between every email is a signature no human produces. Randomize. “Real inbound mail — newsletters, vendor notifications, actual conversations — helps.” Restarting after a pause without re-ramping. Two weeks dark means restarting at roughly 50% of your previous volume and rebuilding over 7-10 days.

   In Warm-up engagement signals

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