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  • 23 Jun 2024
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Warming up an email domain is a crucial step in ensuring successful email marketing campaigns. It involves gradually increasing the volume of emails sent from a new domain to build a positive reputation with Internet Service Providers (ISPs) and email providers. This process helps to improve email deliverability, reduce the risk of emails being marked as spam, and enhance overall campaign effectiveness. In this guide, we will explore the steps to properly warm up an email domain and provide best practices to ensure a smooth and successful process.

Why Warming Up an Email Domain is Important

When you start sending emails from a new domain, ISPs and email providers closely monitor your sending behavior. Sending a large volume of emails right away can raise red flags and lead to your emails being blocked or sent to the spam folder. Warming up your email domain helps you establish a good sending reputation, which is critical for ensuring that your emails reach your recipients’ inboxes.

Steps to Warm Up an Email Domain

1. Set Up Email Authentication

Before you start the warm-up process, it is essential to configure email authentication protocols. These protocols help verify that your emails are coming from a legitimate source and are not being spoofed by spammers.

Email Authentication Protocols:

  • SPF (Sender Policy Framework): Specifies which mail servers are allowed to send emails on behalf of your domain.
  • DKIM (DomainKeys Identified Mail): Adds a digital signature to your emails, verifying that the email has not been altered in transit.
  • DMARC (Domain-based Message Authentication, Reporting, and Conformance): Aligns SPF and DKIM policies to provide instructions to receiving servers on how to handle emails that fail authentication.

Steps to Set Up Email Authentication:

  1. SPF: Publish an SPF record in your domain’s DNS settings that includes the IP addresses of your email servers.
  2. DKIM: Generate DKIM keys and publish the public key as a TXT record in your domain’s DNS settings. Enable DKIM signing in your email server or email service provider.
  3. DMARC: Publish a DMARC record in your domain’s DNS settings with the desired policy (none, quarantine, or reject).

2. Start with a Small Volume

Begin the warm-up process by sending a small number of emails. This initial volume should be manageable and should not raise any red flags with ISPs.

Recommended Initial Volume:

  • Start with around 50-100 emails per day for the first few days.

3. Gradually Increase the Volume

Gradually increase the volume of emails sent each day. The rate at which you increase the volume should be steady and controlled to avoid overwhelming ISPs.

Recommended Warm-Up Schedule:

  • Day 1-3: Send 50–100 emails per day.
  • Day 4-6: Double the volume to 200–300 emails per day.
  • Day 7–10: Increase to 500–700 emails per day.
  • Day 11-14: Increase to 1,000–1,500 emails per day.
  • Continue to double the volume every few days until you reach your desired sending volume.

4. Monitor Email Deliverability and Engagement

Throughout the warm-up process, closely monitor email deliverability and engagement metrics. These metrics will help you identify any issues and adjust your sending strategy accordingly.

Key Metrics to Monitor:

  • Bounce Rate: The percentage of emails that are not delivered. Keep this rate as low as possible.
  • Open Rate: The percentage of recipients who open your emails. Aim for a high open rate to demonstrate engagement.
  • Click-Through Rate (CTR): The percentage of recipients who click on links within your emails. A high CTR indicates that your emails are relevant and engaging.
  • Spam Complaints: The number of recipients who mark your emails as spam. Keep this number low to maintain a positive reputation.

5. Maintain Consistency

Consistency is key during the warm-up process. Ensure that you are sending emails regularly and steadily increasing the volume as planned. Avoid sudden spikes in sending volume, as this can negatively impact your reputation.

6. Use a Quality Email List

Make sure you are sending emails to a clean and engaged email list. Avoid using purchased or outdated email lists, as these can lead to high bounce rates and spam complaints.

Best Practices for Maintaining a Quality Email List:

  • Use double opt-in to confirm subscribers’ consent.
  • Regularly clean your email list to remove inactive or invalid email addresses.
  • Segment your email list to send targeted and relevant content to different groups of subscribers.

Best Practices for Warming Up an Email Domain

Personalize Your Emails

Personalized emails tend to have higher engagement rates. Use your subscribers’ names and other relevant information to make your emails more personalized and engaging.

Send High-Quality Content

Ensure that the content of your emails is valuable and relevant to your recipients. High-quality content will encourage recipients to open and engage with your emails, helping to build a positive reputation.

Monitor Blacklists

Regularly check to ensure that your domain and IP addresses are not listed on any email blacklists. Being on a blacklist can significantly impact your email deliverability.

Test Your Emails

Before sending emails to your entire list, test them to ensure they render correctly across different email clients and devices. Use email testing tools to check for any issues that may affect deliverability.


Warming up an email domain is a critical step in establishing a positive sending reputation and ensuring successful email marketing campaigns. By following the steps outlined in this guide and adhering to best practices, you can effectively warm up your email domain and achieve higher email deliverability rates. Remember to monitor your metrics, maintain consistency, and provide high-quality content to your recipients. With a well-executed warm-up process, you can build a strong foundation for your email marketing efforts and achieve long-term success.

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