# Warmup Duration

### **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.

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**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.