Warmup Duration

Learn the ideal warmup duration for IPs and domains. Gradually increase send volume over 30 days to build reputation and ensure high email deliverability.

How Many Days Should a Warmup Plan Run?

The duration of a warmup plan is critical for building a strong sender reputation. Selecting the right number of warmup days ensures a gradual and consistent increase in email sending volume, avoiding issues like spam flags or IP blacklisting.

Poor Warmup Strategy

• Description: Sending a large volume of emails too quickly causes reputation to drop, as mailbox providers see it as suspicious. This can lead to spam filtering or IP blacklisting.

• Lesson: Avoid sending high volumes immediately, as it harms sender reputation and deliverability.

Ideal Warmup Strategy

• Description: Gradually increasing send volume over time helps reputation grow steadily. This approach builds trust with mailbox providers, ensuring better inbox placement.

• Lesson: Slow, consistent growth in send volume is key to building a strong and reliable sender reputation.

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Ideal Warmup Duration

• Minimum Warmup Period: At least 15 days for low-volume campaigns or smaller email lists.

• Recommended Warmup Period: 30 days is ideal for medium to high-volume campaigns, allowing sufficient time to build trust with mailbox providers.

• Extended Warmup Period: 60 days or more for new domains or IPs that need extra time to establish a reliable sender reputation.

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Factors Affecting Warmup Duration

1. Email Volume:

   • For small campaigns, 15–20 days may be sufficient.

   • Large-scale campaigns require 30+ days for gradual scaling.

2. Domain/IP Reputation:

   • New domains or recently registered IPs benefit from longer warmup plans.

   • Established domains/IPs with no history of spam require a shorter warmup period.

3. Recipient Engagement:

   • High engagement rates (e.g., opens and clicks) may reduce the need for an extended warmup period.

   • Low engagement or high bounce rates may require extending the warmup period.

4. Mailing Frequency:

   • Daily senders should aim for a 30-day warmup.

   • Weekly or occasional senders may extend to 60+ days for consistency.

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Why Stick to the Recommended Warmup Days?

• Mailbox Provider Trust: Gradual volume increases signal authentic and trustworthy behavior.

• Avoids Reputation Damage: Sudden spikes in volume can trigger spam filters or IP blacklisting.

• Ensures Deliverability: Proper warmup ensures emails consistently land in the inbox, not spam folders.