How AI Warmup Boosts Email Deliverability Rates?

Created On:
January 31, 2024
Updated On:
June 3, 2024
How AI Warmup Improves Email Deliverability | Smartlead

Smartlead analytics show that businesses can experience up to a 50% increase in open rates and a 30% boost in click-through rates by employing a strategic warmup process. 

However, building high email deliverability while managing crucial aspects like sender reputation, email list quality, and content can seem like an overwhelming task. 

What is Email Warmup?

Email warmup is the strategic process of gradually establishing a positive sender reputation for a new email account or sender domain. It ensures that your IP or emails are not perceived as spam by the internet service providers (ISPs).

Essentially, email warmup is the calculated measure taken to build and maintain email deliverability. This process ensures a new domain or email account reaches its optimum sending potential, ensuring your messages resonate positively with both automated filters and human recipients.

Email warmup is done by sending a relatively lower number of emails and gradually increasing the number of emails sent (ramp-up) over a predetermined period. This practice aims to signal to ISPs that your email-sending activity is legitimate, fostering trust and improving the likelihood of your messages reaching recipients' inboxes instead of being flagged as spam.

When you create a new email account or migrate from one ESP to another, you get a predetermined daily sending limit for the email account. For example, Gmail Workspace accounts come with a daily sending limit of 2000 emails. However, you can’t start using the full potential right away, and you have to start with a much lower sending volume. 

At, we recommend at least two weeks of email warmup for optimum deliverability. If you have the luxury of warming up for one month, definitely do it - else, two weeks is fine. 

How does AI Warmup Improve Email Deliverability?

AI warmup involves gradually increasing the volume and frequency of email sending from a new or less active email sender domain to establish a positive reputation with email service providers (ESPs) and improve email deliverability. Here's how AI warmup can improve email deliverability:

1. Builds Sender Reputation

Email service providers evaluate the reputation of email senders to determine the fate of their emails – whether they land in the inbox, spam folder, or are blocked altogether. AI warmup enables senders to incrementally increase their email volume, showcasing legitimacy and non-spammy behavior to ESPs.

2. Avoids Spam Filters

A sudden surge in email volume from a new or inactive sender can trigger spam filters. AI warmup neutralizes the risk by starting with a small volume of emails and gradually increasing it (ramp-up), mimicking human-like email-sending behavior. 

Read more: How to stay one step ahead of spam filters here.

3. Predictive Analytics

AI warmup tools such as Smartlead can analyze historical email performance data, identify patterns, and predict the optimal email sending patterns and volume for a successful warmup. AI can help determine the right balance between the number of emails sent and the risk of hitting spam traps or receiving high bounce rates.

3. Establishes Trust

Over time, AI warmup allows email senders to build trust with ESPs. Consistent positive behavior in sending emails fosters trust, making ESPs more inclined to believe that the emails are not malicious or unwanted.

4. Reduces Bounce Rates

Sending a large number of emails without a proper warmup process can result in high bounce rates, indicating that a significant portion of the emails couldn't be delivered. AI warmup helps identify and address deliverability issues early on, reducing bounce rates.

5. Improves Open Rates

A positive sender reputation achieved through warmup enhances the likelihood of emails being delivered to the inbox. Higher inbox placement contributes to improved open rates, as recipients are more likely to see and engage with emails that don't end up in spam folders.

6. Engagement Analysis and Spam Detection

AI can monitor email engagement metrics such as open rates, click-through rates, and conversion rates in real time. It can identify which emails are resonating with recipients and which ones are not, allowing you to adjust your email content and strategy accordingly.

Warmup can help identify potentially spammy content within your emails, reducing the likelihood of your messages being flagged as spam. By avoiding spammy keywords and phrases, you can improve email deliverability.

Besides these, AI warmup can also help in: 

  • Send Time Optimization: AI can analyze recipient behavior to determine the optimal times to send emails to different segments of your audience. Sending emails at the right time can lead to higher engagement and improved deliverability.
  • Feedback Loop Analysis: AI can assist in monitoring feedback loops, which are mechanisms that allow ESPs to report complaints and issues directly to senders. Analyzing this feedback promptly and taking necessary actions can prevent deliverability problems.
  • Adaptive Warmup: AI can dynamically adjust the warmup process based on real-time feedback and changes in recipient behavior. If engagement decreases or spam reports increase, AI can recommend slowing down or making necessary adjustments to avoid harming your sender's reputation.

AI Email Warmup to Scale Sales Outreach

Email warmup may seem time-consuming, but it drastically reduces the time to build your sender reputation. If you directly start sending emails without warming up your inbox, it may take months to make a positive sender reputation. 

On the other hand, warming up your email account will take around two to three weeks (while gradually increasing the number of cold emails sent), and you have a good sender reputation to run your email campaigns. 

Bulk sales emails can trigger spam triggers for ESPs. Sending shortened URLs and images also triggers spam filters, as most spammers use this method to send phishing emails. Of course, you can bypass spam traps by sending plain text emails and full links to domains with high DA (Domain Authority). Email warmups can automate the process of sending, opening, and replying to your emails to build trust among ESPs and improve deliverability for your inbox. 

Automated AI Warmup with Smartlead

Smartlead offers unlimited automated email warmups to ensure your cold email’s inbox placement. You get a self-adjusting and intuitive warmup infrastructure that emulates human-like email-sending activities. Smartlead “manually” moves emails that land in spam to the primary inbox, marking them as important.

Uniquely, Smartlead employs custom identifiers to safeguard your emails from automation parsers. Its intuitive framework slowly amps up email sending volume to ensure natural account transition and automatically matches your leads’ mailbox provider with yours.

You can set up your email account for automated warmup in just a couple of easy steps, given that you have already done DKIM, DMARC, SPF, and MX setup. Here’s how you can do it: 

Sign in to the Smartlead App. click on the “Email Accounts” tab on the left. 

Now, click on the “Add Account(s)” button on the top right corner. 

You can see a popup window to connect your account. Use Gmail, Outlook, Zoho, based on the email account you are using. 

Once you have configured DKIM, SPF, DMARC, and MX record, again navigate to the “Email Accounts” tab and select the email account you want to warmup.

Warm Up Process at Smartlead

Now fill in the configuration details according to the image below. 

Warm Up Process at Smartlead

Keep in mind: 

  • Enable email warmup by clicking on the “Enable Email Warmup” button.  
  • Please fill in the “total number of warm-up emails per day. " If you’re just starting out, we recommend starting with 4-8 warm-up emails per day. 
  • After two weeks, you can increase the warm-up volume to 20-30 emails per day per account.
  • If you have a new mailbox, turn on the “Daily Ramp Up” feature, which will automatically increase the number of emails sent every day. 
  • Look more human with the “Randomise number of warmup emails per day” feature.
  • Set the reply rate between 30-40% to boost deliverability and reputation. 
  • Set a “Custom Warmup Identifier Tag” for easy sorting of warmup emails. 

Now, click on the “Save” button, and you are done. If you have used the warmup service before, you need to click on the “Update” button.  

You can enable auto-adjust warmup/sending ratio where Smartlead adjusts warmups to improve deliverability. 

Warm Up Process at Smartlead

We recommend starting with 4-8 warm-up emails per day per account with a target reply rate of 30%. After two weeks, you can increase the warm-up volume to 20-30 emails per day per account, with a higher target reply rate of 70% when engaging in outreach. The maximum recommended warm-up email volume is 50 emails per day, with a reply rate of a max of 60%. 

Best Practices Checklist for High Email Deliverability 


  • Use double opt-in forms in your app/website to catch email leads. 
  • Make sure your domain name redirects to your website. 
  • Authenticate your emails with DKIM, DMARC, and SPF protocols.  
  • Monitor blocklists and spam complaints and address the issues that occur. 
  • Gradually increase the number of emails sent. 
  • Use mobile-optimized designs and A/B test your email content. 
  • Engage with your subscribers through other channels, such as social media and blog content. 
  • Always integrate the “Opt-Out/Unsubscribe” button into your emails. 
  • Be compliant with commercial email laws such as the CAN-SPAM Act, GDPR, Spam Act 2003, etc. 


  • Don’t buy email lists from third-party providers, as these lists can contain spam traps and inactive email addresses. 
  • Don’t start sending large volumes of emails at once. 
  • Avoid link shorteners like Bitly for your sales emails. 
  • Don’t send emails with any large attachments. (Attachments can only be sent after a lead replies) 
  • Don’t send emails with excessive punctuation or capitalization, as this can make your emails look like spam emails.


In conclusion, implementing an email warmup strategy is a crucial step for businesses aiming to enhance their email deliverability rates. Email warmup, at its core, is a calculated process that gradually establishes a positive sender reputation for a new email account or sender domain. This method ensures that your emails are not perceived as spam by internet service providers (ISPs). 

At, we recommend at least a two-week warmup period for optimum deliverability, though extending it to one month, if possible, is even better. Our automated AI warmup infrastructure offers a self-adjusting and intuitive approach that emulates human-like email-sending behavior, ensuring your cold emails land in the primary inbox and are marked as important.

With a few easy steps, you can set up your email account for automated warmup, provided you have already configured essential protocols like DKIM, DMARC, SPF, and MX records. By enabling email warmup, gradually increasing sending volumes, and utilizing features like randomizing email volumes and setting custom warmup identifier tags, you can improve the chances of your emails reaching the right audience.

To maximize your chances of email success, follow the best practices checklist for high email deliverability, including using double opt-in forms, authenticating your emails, monitoring blocklists and spam complaints, and gradually increasing your email volume. Additionally, engage with your subscribers through various channels and comply with commercial email laws to maintain a positive sender reputation.


How do you warm up an email?

To warm up an email address or sender domain effectively, follow these steps:

  • Begin by sending a very small volume of emails, well below your eventual sending limits. For instance, if you have a new email account, start with just a few emails per day. Over a period of two to four weeks, slowly increase the number of emails you send each day. This gradual ramp-up signals to email service providers (ESPs) that your email-sending activity is legitimate and not spammy. A typical warmup schedule might start with 4-8 emails per day and gradually increase to 20-30 emails per day after two weeks. Ensure that you maintain a positive sender reputation by monitoring your email engagement and adjusting your strategy as needed. Remember to configure essential email authentication protocols like DKIM, DMARC, SPF, and MX records to boost your credibility and improve deliverability.

What is the best email warmup tool? offers a comprehensive and automated solution that excels in ensuring your cold emails land in the primary inbox and are marked as important, which is crucial for successful email marketing campaigns. With its self-adjusting and intuitive warmup infrastructure, Smartlead emulates human-like email-sending activities, building trust with internet service providers (ISPs) and improving your sender reputation. Moreover, Smartlead employs custom identifiers to safeguard your emails from automation parsers, ensuring that your emails are delivered reliably to your recipients.

Smartlead simplifies the warmup process, allowing you to set up your email account for automated warmup in just a few easy steps, provided you've already configured DKIM, DMARC, SPF, and MX records. It offers features such as daily ramp-up, randomizing email volumes, and custom warmup identifier tags to fine-tune your warmup strategy. Smartlead's AI-driven approach ensures that your email warmup is optimized for success, making it the top choice for businesses looking to improve their email deliverability and maximize the impact of their email marketing efforts.

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Author’s Details

Sattwik Das

Sattwik is a Digital Marketing professional at Smartlead. He is a dedicated content writer who focuses on juggling words to bring out meaningful content. He is experienced in well-researched and SEO-optimized content creation, content editing, and copywriting for various businesses throughout the globe. His expertise in SEO, SMM, and SMO with a touch of creativity helps businesses grow and maximize their credibility and sales.


Edited by:

Sattwik Das


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General Questions

What is Smartlead's cold email outreach software?

Email automation FAQs- Smartlead

Smartlead's cold email outreach tool helps businesses scale their outreach efforts seamlessly. With unlimited mailboxes, fully automated email warmup functionality, a multi-channel infrastructure, and a user-friendly unibox, it empowers users to manage their entire revenue cycle in one place. Whether you're looking to streamline cold email campaigns with automated email warmups, personalization fields, automated mailbox rotation, easy integrations, and spintax, improve productivity, or enhance scalability with subsequences based on lead’s intentions, automated replies, and full white-label experience, our cold email tool implifies it in a single solution.

What is Smartlead, and how can it enhance my cold email campaigns?

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Smartlead is a robust cold emailing software designed to transform cold emails into reliable revenue streams. Trusted by over 31,000 businesses, Smartlead excels in email deliverability, lead generation, cold email automation, and sales outreach. A unified master inbox streamlines communication management, while built-in email verification reduces bounce rates.
Additionally, Smartlead offers essential tools such as CNAME, SPF Checker, DMARC Checker, Email Verifier, Blacklist Check Tool, and Email Bounce Rate Calculator for optimizing email performance. 

How does the "unlimited mailboxes" feature benefit me?

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Our "unlimited mailboxes" feature allows you to expand your email communications without restrictions imposed by a mailbox limit. This means you won't be constrained by artificial caps on the number of mailboxes you can connect and use. This feature makes Smartlead the best cold email software and empowers you to reach a wider audience, engage with more potential customers, and manage diverse email campaigns effectively.

How does Smartlead as a cold emailing tool can automate the cold email process?

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Smartlead’s robust cold email API and automation infrastructure streamline outbound communication by transforming the campaign creation and management processes. It seamlessly integrates data across software systems using APIs and webhooks, adjusts settings, and leverages AI for personalised content.

The cold emailing tool categorises lead intent, offers comprehensive email management with automated notifications, and integrates smoothly with CRMs like Zapier, Make, N8N, HubSpot, Salesforce, and Pipedrive. Smartlead supports scalable outreach by rapidly adding mailboxes and drip-feeding leads into active campaigns Sign Up Now!

What do you mean by "unibox to handle your entire revenue cycle"?

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The "unibox" is one of the unique features of Smartlead cold email outreach tool, and it's a game-changer when it comes to managing your revenue cycle. The master inbox or the unibox consolidates all your outreach channels, responses, sales follow-ups, and conversions into one centralized, user-friendly mailbox.

With the "unibox," you gain the ability to:
1. Focus on closing deals: You can now say goodbye to the hassle of logging into multiple mailboxes to search for replies. The "unibox" streamlines your sales communication, allowing you to focus on what matters most—closing deals.

2. Centralized lead management: All your leads are managed from one central location, simplifying lead tracking and response management. This ensures you take advantage of every opportunity and efficiently engage with your prospects.

3. Maintain context: The "unibox" provides a 360-degree view of all your customer messages, allowing you to maintain context and deliver more personalized and effective responses.

How does Smartlead ensure my emails don't land in the spam folder?

Email automation FAQs- Smartlead

Smartlead, the best cold email marketing tool, ensures your emails reach the intended recipients' primary inbox rather than the spam folder. 

Here's how it works:
1. Our "unlimited warmups" feature is designed to build and maintain a healthy sending reputation for your cold email outreach. Instead of sending a large volume of emails all at once, which can trigger spam filters, we gradually ramp up your sending volume. This gradual approach, combined with positive email interactions, helps boost your email deliverability rates.

2. We deploy high-deliverability IP servers specific to each campaign. 

3. The ‘Warmup’ feature replicates humanized email sending patterns, spintax, and smart replies.
4. By establishing a positive sender reputation and gradually increasing the number of sent emails, Smartlead minimizes the risk of your emails being flagged as spam. This way, you can be confident that your messages will consistently land in the primary inbox, increasing the likelihood of engagement and successful communication with your recipients.

Can Smartlead help improve my email deliverability rates?

Email automation FAQs- Smartlead

Yes, our cold emailing software is designed to significantly improve your email deliverability rates. It enhances email deliverability through AI-powered email warmups across providers, unique IP rotating for each campaign, and dynamic ESP matching.
Real-time AI learning refines strategies based on performance, optimizing deliverability without manual adjustments. Smartlead's advanced features and strategies are designed to improve email deliverability rates, making it a robust choice for enhancing cold email campaign success.

What features does Smartlead offer for cold email personalisation?

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Smartlead enhances cold email personalisation through advanced AI-driven capabilities and strategic integrations. Partnered with Clay, The cold remaining software facilitates efficient lead list building, enrichment from over 50 data providers, and real-time scraping for precise targeting. Hyper-personalised cold emails crafted in Clay seamlessly integrate with Smartlead campaigns.

Moreover, Smartlead employs humanised, natural email interactions and smart replies to boost engagement and response rates. Additionally, the SmartAI Bot creates persona-specific, high-converting sales copy. Also you can create persona-specific, high-converting sales copy using SmartAI Bot. You can train the AI bot to achieve 100% categorisation accuracy, optimising engagement and conversion rates.

Can I integrate Smartlead with other tools I'm using?

Email automation FAQs- Smartlead

Certainly, Smartlead cold email tool is designed for seamless integration with a wide range of tools and platforms. Smartlead offers integration with HubSpot, Salesforce, Pipedrive, Clay, Listkit, and more. You can leverage webhooks and APIs to integrate the tools you use. Try Now!

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Is Smartlead suitable for both small businesses and large enterprises?

Smartlead accommodates both small businesses and large enterprises with flexible pricing and comprehensive features. The Basic Plan at $39/month suits small businesses and solopreneurs, offering 2000 active leads and 6000 monthly emails, alongside essential tools like unlimited email warm-up and detailed analytics.

Marketers and growing businesses benefit from the Pro Plan ($94/month), with 30000 active leads and 150000 monthly emails, plus a custom CRM and active support. Lead generation agencies and large enterprises can opt for the Custom Plan ($174/month), providing up to 12 million active lead credits and 60 million emails, with advanced CRM integration and customisation options.

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What type of businesses sees the most success with Smartlead?

No, there are no limitations on the number of channels you can utilize with Smartlead. Our cold email tool offers a multi-channel infrastructure designed to be limitless, allowing you to reach potential customers through multiple avenues without constraints.

This flexibility empowers you to diversify your cold email outreach efforts, connect with your audience through various communication channels, and increase your chances of conversion. Whether email, social media, SMS, or other communication methods, Smartlead's multi-channel capabilities ensure you can choose the channels that best align with your outreach strategy and business goals. This way, you can engage with your prospects effectively and maximize the impact of your email outreach.

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How can Smartlead integrate with my existing CRM and other tools?

Smartlead is the cold emailing tool that facilitates seamless integration with existing CRM systems and other tools through robust webhook and API infrastructure. This setup ensures real-time data synchronisation and automated processes without manual intervention. Integration platforms like Zapier, Make, and N8N enable effortless data exchange between Smartlead and various applications, supporting tasks such as lead information syncing and campaign status updates. Additionally, it offers native integrations with major CRM platforms like HubSpot, Salesforce, and Pipedrive, enhancing overall lead management capabilities and workflow efficiency. Try Now!

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Do you provide me with lead sources?

No. Smartlead distinguishes itself from other cold email outreach software by focusing on limitless scalability and seamless integration. While many similar tools restrict your outreach capabilities, Smartlead offers a different approach.

Here's what makes us uniquely the best cold email software:

1. Unlimited Mailboxes: In contrast to platforms that limit mailbox usage, Smartlead provides unlimited mailboxes. This means you can expand your outreach without any arbitrary constraints.

2. Unique IP Servers: Smartlead offers unique IP servers for every campaign it sends out. 

3. Sender Reputation Protection: Smartlead protects your sender reputation by auto-moving emails from spam folders to the primary inbox. This tool uses unique identifiers to cloak all warmup emails from being recognized by automation parsers. 

4. Automated Warmup: Smartlead’s warmup functionality enhances your sender reputation and improves email deliverability by maintaining humanised email sending patterns and ramping up the sending volume. 

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How secure is my data with Smartlead?

Ensuring the security of your data is Smartlead's utmost priority. We implement robust encryption methods and stringent security measures to guarantee the continuous protection of your information. Your data's safety is paramount to us, and we are always dedicated to upholding the highest standards of security.

How can I get started with Smartlead?

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Getting started with Smartlead is straightforward! Just head over to our sign-up page and follow our easy step-by-step guide. If you ever have any questions or need assistance, our round-the-clock support team is ready to help, standing by to provide you with any assistance you may require. Sign Up Now!

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We're here to assist you! You can easily get in touch with our dedicated support team on chat. We strive to provide a response within 24 hours to address any inquiries or concerns you may have. You can also reach out to us at

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