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  • 24 Jun 2024


Email warm-up is a process used to gradually increase the volume of emails sent from a new email account or an account that has been inactive for a while, with the aim of building a positive sending reputation with email service providers (ESPs). This process is important because it helps to avoid emails being marked as spam, improves deliverability, and ensures that the emails reach the inbox of the recipients rather than being filtered into the spam folder or being blocked altogether.

The warm-up process involves starting with a low number of emails and gradually increasing the volume over a period of time. The idea is to mimic human behavior and establish the account as a legitimate source of email communication. During this period, it’s also crucial to engage with the recipients who respond to your emails, as positive engagement (like replies, moving emails from spam to the inbox, marking as important) further boosts the sender’s reputation.

Here’s a general outline of how an email warm-up might look:

  1. Start Slow: Begin by sending a small number of emails per day (e.g., 5-10 emails) from the new or reactivated account.
  2. Gradually Increase Volume: Slowly increase the number of emails sent per day or week, following a predetermined schedule, until you reach your desired volume.
  3. Monitor Responses: Pay attention to the responses and engagement from the recipients. Positive interactions can help improve your sender reputation.
  4. Adjust Based on Feedback: If you notice a high rate of emails being marked as spam or not being delivered, reduce the volume and investigate potential issues with your email content or list quality.

By warming up an email account properly, you’re effectively signaling to ESPs that your email sending practices are legitimate and that your emails should be trusted, which is crucial for any business or individual relying on email communication for marketing, outreach, or other purposes.

A Closer Look At Email Warm Up

Taking a closer look at the email warm-up process reveals its nuances and underscores its importance for anyone looking to establish or maintain a credible presence in the inboxes of their audience. This process is particularly critical for marketers, sales professionals, and businesses that rely on email as a key communication and engagement tool. Here’s a more detailed exploration of the phases and considerations involved in email warm-up:

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1. Preparation Phase

  • Audit Your Email List: Before starting the warm-up process, ensure your email list is clean and up-to-date. Remove invalid or inactive addresses to improve deliverability and engagement rates.
  • Set Up Authentication Protocols: Implement email authentication methods like SPF (Sender Policy Framework), DKIM (DomainKeys Identified Mail), and DMARC (Domain-based Message Authentication, Reporting, and Conformance) to help verify your identity as a sender and improve email deliverability.

2. Initial Sending Phase

  • Segment Your Audience: Start with a highly engaged segment of your email list. These recipients are more likely to open and interact with your emails, sending positive signals to email service providers.
  • Craft Engaging Content: Ensure that the emails sent during the warm-up phase are highly relevant and engaging to encourage opens, clicks, and replies.

3. Ramping Up

  • Gradual Increase: Incrementally increase the volume of emails sent over a period of weeks. There’s no one-size-fits-all schedule; the pace can vary based on your industry, the size of your email list, and your typical sending volume.
  • Engagement Tracking: Monitor key metrics such as open rates, click-through rates, and the rate of emails marked as spam. This feedback will guide your adjustments to the warm-up schedule and email content.
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4. Monitoring and Adjusting

  • Feedback Loops: Set up feedback loops with major ISPs (Internet Service Providers) to receive notifications when recipients mark your emails as spam. This insight allows you to further clean your list and adjust your approach.
  • Adjust Based on Performance: If you encounter deliverability issues, take a step back and reduce your sending volume. Review your email content and list health before increasing volume again.

5. Post-Warm-Up Maintenance

  • Consistent Sending Volume: After the warm-up, maintain a consistent volume and frequency of emails. Sudden spikes or drops in activity can trigger ESPs to flag your emails.
  • Continual Engagement and List Hygiene: Regularly clean your email list and continue to segment your audience based on engagement. This helps in sustaining a good sender reputation.

Additional Considerations

  • Automated Warm-Up Tools: Several tools and services automate the email warm-up process, gradually increasing sending volumes and simulating engagement activities. These can be particularly useful for businesses scaling up their email operations.
  • ESP Specific Guidelines: Different email service providers have their guidelines and thresholds for sending practices. Familiarize yourself with the policies of the ESPs most used by your audience.

Email warm-up is a critical but often overlooked aspect of email marketing and outreach strategies. It requires patience, attention to detail, and a willingness to adjust strategies based on performance and feedback. By investing the time and resources into properly warming up your email accounts, you set the foundation for successful email campaigns that reach their intended recipients and achieve their goals.

Why Is Email Warm-Up Important?

Email warm-up is a critical step for anyone looking to use email as a reliable channel for communication, marketing, or outreach. Its importance stems from several key factors that directly impact the effectiveness of your email campaigns:

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1. Improves Email Deliverability

Email service providers (ESPs) use sophisticated algorithms to determine whether an email should be delivered to the recipient’s inbox, spam folder, or not delivered at all. These algorithms look at various signals, including the sender’s reputation. By warming up an email account, you gradually build a positive sending reputation, signaling to ESPs that your emails are legitimate and should be delivered to the inbox.

2. Prevents Emails from Being Marked as Spam

A sudden spike in email volume from a new or inactive account can raise red flags with ESPs, leading them to mark your emails as spam. This not only affects your current campaign but can also tarnish your sender reputation long-term, making it more challenging to reach your audience’s inboxes in the future. Warming up your email helps avoid this by establishing a history of regular, moderate email activity.

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3. Builds Sender Reputation

A good sender reputation is crucial for email marketing success. It’s a score that ESPs assign to email senders based on factors like the volume of emails sent, how recipients interact with those emails (opens, clicks, marks as spam), and the number of bounces. A warm-up process helps build and maintain a positive sender reputation by ensuring that these factors are optimized from the start.

4. Enhances Email Engagement Rates

Starting with a warm-up process allows you to focus on engaging your most active and interested subscribers first. This strategy not only helps in building your sender reputation but also tends to yield higher open and click-through rates. Positive engagement metrics further reinforce your good standing with ESPs, improving overall deliverability.

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5. Reduces the Risk of Being Blacklisted

Being blacklisted by ESPs or anti-spam organizations can have severe consequences for your email campaigns, effectively blocking your emails from reaching your audience. A thoughtful warm-up process reduces the risk of engaging in behaviors that trigger blacklisting, such as sending too many emails too quickly or having a high rate of email bounces and spam complaints.

6. Facilitates Successful Email Campaigns

Ultimately, the goal of any email campaign is to reach and engage your audience effectively. By ensuring that your emails are delivered to the inbox, you maximize the visibility of your content, leading to better campaign performance, whether that’s measured by sales, sign-ups, or other engagement metrics.

In summary, the email warm-up process is a foundational step for anyone serious about using email as a communication tool. It not only safeguards against immediate deliverability issues but also sets the stage for sustained email marketing success by establishing a trustworthy sender reputation.

How To Warm Up An Email For Cold Outreach?


Warming up an email for cold outreach involves a deliberate process to gradually establish the email account’s reputation, ensuring your messages reach the inbox of your prospects. This process is crucial for avoiding spam filters and maximizing the effectiveness of your outreach efforts. Here’s a step-by-step guide to warming up an email for cold outreach:

1. Prepare Your Email Account

  • Set Up Authentication Protocols: Before you start sending emails, ensure that SPF, DKIM, and DMARC records are correctly set up for your domain. These protocols authenticate your emails, making them more likely to be accepted by recipient email servers.
  • Personalize Your Email Account: Complete your email profile by adding a profile picture, setting up a signature, and filling out any other relevant details to make the account appear legitimate and professional.

2. Start With a Clean Email List

  • Verify Email Addresses: Use an email verification tool to ensure the email addresses on your list are valid and active. This reduces bounce rates, which can negatively impact your sender reputation.
  • Segment Your List: Begin with a small, highly engaged segment of your list. These recipients are more likely to interact positively with your emails, sending good signals to email service providers (ESPs).

3. Begin Sending Emails Gradually

  • Start Small: In the first week, start by sending a low volume of emails (e.g., 10-20 emails per day) and gradually increase the number over several weeks. This gradual increase helps avoid triggering spam filters.
  • Personalize Your Emails: Personalization can significantly increase the chances of your emails being opened and replied to. Use the recipient’s name, reference specific details relevant to them, and ensure the content is highly targeted.

4. Engage in Genuine Conversations

  • Encourage Replies: Tailor your emails to encourage a response. For example, you could ask a question or invite feedback. Replies are a strong positive signal to ESPs.
  • Respond Promptly: When you receive replies, respond to them promptly to keep the conversation going and continue building your email’s engagement metrics.

5. Monitor Your Email Performance

  • Track Deliverability: Use tools to monitor whether your emails are reaching the inbox, landing in the spam folder, or not being delivered at all.
  • Adjust Based on Feedback: If you notice issues, such as a high rate of emails going to spam, take steps to address these problems. This may involve adjusting your email content, reducing your sending volume, or further cleaning your email list.

6. Automate and Scale Carefully

  • Consider Warm-up Services: If you’re scaling your cold outreach efforts, consider using an email warm-up service. These services can automate the process of gradually increasing your sending volume and engaging with emails to build your sender reputation.
  • Scale Gradually: Even with automation, it’s important to scale your email volume gradually to avoid sudden spikes that could harm your sender reputation.

7. Maintain Good Practices

  • Keep Your List Clean: Regularly clean your email list to remove unengaged subscribers and invalid email addresses.
  • Stay Compliant: Ensure your emails comply with laws like GDPR in Europe and the CAN-SPAM Act in the United States, which set guidelines for commercial emails.

Warming up an email for cold outreach is a process that requires patience and attention to detail. By following these steps, you can significantly improve your email deliverability, engagement, and overall success in reaching your target audience.

Factors Affecting Email Warm Up


The email warm-up process is influenced by a variety of factors, each playing a critical role in determining how quickly and effectively an email sender can establish a positive reputation with email service providers (ESPs). Understanding these factors is crucial for anyone looking to optimize their email deliverability and ensure their messages reach the intended inboxes. Here are the key factors affecting email warm-up:

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1. Email Volume and Frequency

  • Gradual Increase: How quickly and how much you increase your email volume can significantly impact the warm-up process. A gradual increase is essential to avoid triggering spam filters.
  • Consistency: Maintaining a consistent sending frequency helps establish reliability and trust with ESPs.

2. Email List Quality

  • List Cleanliness: The presence of invalid, inactive, or non-consenting email addresses can increase bounce rates and spam complaints, negatively affecting your sender reputation.
  • Engagement Levels: High engagement rates (opens, clicks, replies) from recipients signal to ESPs that your emails are welcomed and valued, improving your sender score.

3. Content Relevance and Quality

  • Personalization and Relevance: Emails that are personalized and highly relevant to the recipient are more likely to be opened and engaged with, positively influencing your warm-up progress.
  • Spammy Content: Using too many sales-oriented words, large images, or poor HTML in emails can trigger spam filters, hindering your warm-up efforts.

4. Recipient Interaction

  • Positive Actions: Opens, replies, moving an email from the spam folder to the inbox, and adding the sender to the contacts list are all positive interactions that boost your sender reputation.
  • Negative Actions: High rates of unsubscribes, spam reports, and ignored emails can damage your sender reputation.

5. Authentication Protocols

  • SPF, DKIM, and DMARC: Proper setup of these email authentication methods is crucial. They help verify your emails’ legitimacy, reducing the likelihood of them being flagged as spam.

6. Email Sending Infrastructure

  • IP Address Reputation: The reputation of the IP address from which emails are sent plays a significant role. New IP addresses have no history and must be carefully warmed up.
  • Use of Subdomains: Employing subdomains for different email activities can help isolate and protect the main domain’s reputation.

7. Feedback and Adjustments

  • Monitoring and Responsiveness: Regularly monitoring delivery rates, open rates, and other engagement metrics, and being ready to adjust your strategy based on this feedback, is vital for a successful warm-up.

8. Compliance with Email Regulations

  • Legal Compliance: Ensuring your emails comply with laws like GDPR, CAN-SPAM, and others not only helps avoid legal issues but also supports your reputation with both recipients and ESPs.

9. Use of Email Warm-up Services

  • Automated Warm-up Tools: Using dedicated tools or services that automate parts of the warm-up process can influence the speed and effectiveness of warming up, provided they are used correctly and ethically.

By paying attention to these factors and adjusting your email warm-up strategy accordingly, you can build a strong sender reputation that ensures your emails reach your audience’s inboxes, thereby enhancing the overall effectiveness of your email communication efforts.

List of the best email warm-up tools


As of my last update, there were several email warm-up tools available in the market, each offering unique features to help users gradually increase their sending volume and improve their sender reputation with email service providers (ESPs). Here’s a list of some of the best email warm-up tools known for their effectiveness and reliability:

1. Mailwarm

  • Description: Mailwarm interacts with your emails by automatically sending and receiving messages to warm up your email account. It helps increase your sender reputation by simulating human-like interactions.
  • Key Features: Daily interactions, feedback loop, detailed analytics.

2. Warmbox.ai

  • Description: Warmbox.ai offers a fully automated service to warm up your email account across various ESPs. It’s designed to increase your deliverability by improving your sender score.
  • Key Features: Customizable warm-up plans, support for multiple ESPs, deliverability analytics.

3. Lemwarm (by Lemlist)

  • Description: Lemwarm, part of Lemlist’s suite of tools, focuses on warming up your email account by sending emails between it and a community of real users, ensuring genuine interactions.
  • Key Features: Community-based warming, engagement tracking, Lemlist integration.

4. QuickMail Auto Warmer

  • Description: QuickMail’s Auto Warmer feature is designed to improve your email deliverability by automatically sending emails between your account and other QuickMail users, ensuring your emails are consistently engaged with.
  • Key Features: Automatic setup, engagement tracking, user community interactions.

5. Folderly

  • Description: Folderly aims to boost your email deliverability by analyzing your email performance and offering a personalized warm-up and deliverability optimization plan.
  • Key Features: Email health check, spam fix, deliverability monitoring.

6. Warmup Inbox

  • Description: Warmup Inbox helps improve your email sender reputation by sending emails from your account to its network, ensuring your emails are opened, marked as important, and replied to.
  • Key Features: Network-based interactions, detailed reporting, ISP feedback loops.

7. Postaga

  • Description: While primarily an outreach tool, Postaga offers an email warm-up feature that helps prepare your email account for outreach campaigns by building up your sender reputation gradually.
  • Key Features: Outreach campaign integration, sender reputation building, automated follow-ups.

When choosing an email warm-up tool, consider factors such as compatibility with your email provider, ease of use, the extent of automation, and the specific features that align with your email warming and deliverability goals. Additionally, it’s wise to regularly review and compare tools as the market and technologies evolve to ensure you’re using the best solution for your needs.

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