What is email warmup and why is it important?

Email warmup is the process of gradually increasing your sending volume to build domain reputation. New domains that send high volumes immediately get flagged as spam. Warmup establishes trust with email providers.

How long does email warmup take?

Typically 4-8 weeks to reach full volume safely. Start with 10-20 emails/day and increase by 20-30% weekly. Rushing warmup leads to deliverability problems that can take months to recover from.

Can I skip email warmup?

No. Skipping warmup almost guarantees deliverability issues. Even established domains need mini-warmups after extended periods of inactivity or significant volume increases. The investment in warmup pays off in better inbox placement.

Back to Tools

Email Warmup Calculator

Plan your email domain warmup schedule. Calculate how long it takes to safely scale your sending volume without hurting deliverability.

Email Warmup Calculator

Calculate your domain warm-up timeline

Brand New Domain?

Less than 30 days old

Target Daily Send Volume

Email Warmup Best Practices

• Start slow: Begin with 10-20 emails per day for new domains
• Gradual increase: Increase volume by 20-30% weekly
• Mix interactions: Include replies and conversations, not just sends
• Monitor reputation: Watch for bounce rates and spam complaints
• Use warmup tools: Services like Warmbox or Instantly can automate this

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