Acceleration Strategies for Email Warm-up: Insider Hacks

Created On:
December 1, 2023
Updated On:
February 22, 2024
email warmup tool

Ensuring your cold emails land right in the recipient's inbox rather than their spam folder can feel like a Herculean task, especially when you're reaching out to them for the first time. Did you know that an astonishing percentage of emails end up in spam? This is especially concerning, given Google's latest updates to its spam policies. 

Now more than ever, it's crucial to warm up your domain and email accounts before you kick off your outreach campaign. But what exactly does 'email warmup' mean? Why is it so important? Which are the best tools to use for this process? And how does Smartlead fit into all of this? In today's blog post, we'll delve into these questions, providing you with insider hacks to accelerate your 'email warmup' process

What Does Email Warmup Mean?

In the world of email marketing, 'email warmup' is like a pre-game stretch. It's all about preparing your domain like a runner limbers up before a race to ensure that your emails hit the inbox and not the spam folder. So how does this work? Let's break it down.

Imagine you just set up a new email account or domain. The first thing you do is start firing off hundreds or thousands of emails. But wait! This sudden flurry of activity might raise red flags with Internet Service Providers (ISPs). They might see your account as potential spam, pushing your emails into the dreaded spam folder. That's where email warmup comes in.

Email warmup is like making small talk at a party before diving into deep conversations. You start by sending a few emails, then gradually increase the volume. This slow and steady approach shows ISPs that you're a legitimate sender, improving your reputation and ensuring your emails land in the inbox.

Now, you could do this manually, but let's be real – who has the time? Plus, it can be tricky getting the pace just right. That's where email warmup tools come into play. These AI-powered wizards mimic human-like conversations, sending out emails at a natural, gradual pace. This process, known as domain warmup or mail warmup, effectively convinces ISPs that your domain is trustworthy, boosting your email deliverability rates.

Why Perform Email Warmup?

Now that we understand what email warmup is, you might be wondering why you should even bother with this process. The answer lies in the benefits it brings to your email marketing efforts. Here are five critical reasons you should be warming up your emails:

  • Boost Email Deliverability Rates: Warming up your emails can significantly improve your email deliverability rates. It's a way of showing ISPs that you're not a spammer but a legitimate sender who respects the rules of the game. This can dramatically increase the chances of your emails landing in the recipient's inbox rather than their spam folder.
  • Protects Your Domain: Your domain's reputation is crucial. A poor reputation can have serious consequences, including emails being blocked or landing in spam. By warming up your domain, you're taking steps to protect it and maintain a good standing with ISPs.
  • Boost Your Open Rate: When your emails land in the right place (the inbox!), they're more likely to be opened. A higher open rate can lead to better engagement, conversions, and, ultimately, a successful email marketing campaign.
  • Protects Your Sender Reputation: In the world of email marketing, your sender reputation is like your credit score. A good score means ISPs trust you, and your emails are more likely to reach the inbox. Email warmup helps to build and maintain this reputation.
  • Expands Your Sending Limit: Most email providers impose a daily sending limit. By warming up your account, you can gradually increase this limit, allowing for larger email campaigns.

Best Tools for Email Warmup

So, you're convinced about the importance of warming up your emails. But how do you actually go about it? The good news is there are a variety of email warmup tools that can help you with this task. These tools use sophisticated techniques to mimic human-like interactions in your email account, gradually increasing the pace of sending emails to help you achieve optimal email deliverability. Let's take a closer look at five of the top tools in the market: acts as a silent partner in your email marketing efforts, interacting with your emails and sending positive signals to email providers.


  • Automated Interactions: automates the process of email interactions, which can save a significant amount of time and effort.
  • Positive Reputation Building: The tool helps build your reputation by simulating genuine email activity, ensuring your emails don't land in the spam folder.


  • Limited Customization: offers fewer customization options compared to some other tools on the market.
  • Pricing: While offers a free trial, some users might find the pricing plans slightly expensive.

TrulyInbox: TrulyInbox takes a comprehensive approach to email warmup, gradually increasing your sending volume while ensuring positive engagement with your emails.


  • Comprehensive Approach: TrulyInbox covers all aspects of email warm-up, making it a one-stop solution.
  • User-friendly Interface: The tool is easy to use, even for beginners, with a clean and intuitive interface.


  • Lack of Advanced Features: Some users might find the lack of advanced features limiting.
  • Support: Some users have reported slow response times from customer support.

Mailwarm: Mailwarm is a tool designed specifically for email warmup, using AI to simulate human-like conversations and gradually ramp up your email volume.


  • AI Capabilities: Mailwarm's AI capabilities allow for more realistic and convincing email interactions.
  • Gradual Sending Increase: The tool effectively increases your sending volume over time, improving your reputation with ISPs.


  • Limited Free Options: Mailwarm does not offer a free version or trial, which can be a barrier for some users.
  • Complexity: Some users might find the interface and features a bit complex to navigate.

Lemwarm: A feature of Lemlist, Lemwarm automates your email warmup process, sending out emails to a list of monitored inboxes.


  • Automation: Lemwarm takes care of the entire warmup process, allowing you to focus on other aspects of your campaign.
  • Part of Lemlist: Being part of Lemlist, you get access to a range of other email marketing tools and features.


  • Limited Standalone Use: As it's part of Lemlist, you might not get as much value from it if you're only interested in the email warmup feature.
  • Pricing: Lemwarm is not available as a standalone product, which means you need to invest in the entire Lemlist suite.

Woodpecker: Woodpecker offers a free warmup feature that gradually increases your email-sending volume over time by simulating real-life email-sending patterns.


  • Free Feature: Woodpecker's warmup feature comes free with the tool, making it an excellent option for those on a budget.
  • Realistic Sending Patterns: The tool effectively mimics real-life email sending patterns, helping improve your sender reputation.


  • Limited Warmup Control: Some users might find the warmup feature a bit basic, with less control over the process compared to other tools.
  • Dependent on Woodpecker: If you don't use Woodpecker for your email campaigns, the warmup feature might not be as beneficial.

How To Warm Up Emails Using Smartead

If you've been wondering how to warm up emails effectively, Smartlead is a tool worth considering. This powerful email warmup service leverages advanced AI technology to ensure your messages always land in your recipients' inboxes, not their spam folders.

Smartlead operates by auto-emulating human-like conversations with its AI warmups. This means it sends and replies to emails in a way that mimics human behaviour, which can dramatically improve your sender's reputation with ISPs. The AI-driven system also self-adjusts your warmup infrastructure to defend your email deliverability, ensuring you don't fall foul of spam filters.

One of the standout features of Smartlead is its unlimited AI warmups. This means you can warm up multiple inboxes simultaneously, allowing you to scale your outreach campaign effectively. Whether you're sending out dozens or thousands of emails, Smartlead can handle the load.

But Smartlead doesn't stop there. It also offers a feature to warm up your campaign copy. By sending out your actual email content as part of the warmup process, Smartlead helps drive primary inbox placement. This can significantly boost your open rates and overall campaign success.

In short, Smartlead stands out as one of the best email warmup tools on the market. With its advanced AI capabilities and unlimited warmups, it's a robust solution for anyone looking to improve their email deliverability and campaign performance.


Warming up your emails is a crucial step in any successful email marketing campaign. It helps ensure your messages reach the intended recipient and don't end up in the dreaded spam folder. 

Among the various tools available, Smartlead stands out as one of the best email warmup tools on the market. With its advanced AI capabilities, unlimited warmups, and innovative features, it's designed to take your cold email outreach to the next level. So why wait? 

Sign up for a free trial of Smartlead today and experience the difference it can make in your email marketing efforts. Remember, the first step towards better deliverability starts with a warm inbox. Let Smartlead guide you along the way.

Frequently Asked Questions

  • What is the recommended duration for an email warmup process?

The recommended duration for an email warmup process can vary, but it generally ranges between 2 weeks to 3 months. The exact timeframe depends on several factors, including your email volume and engagement rate. It's always best to start slow and gradually increase email sending over time.

  • Do I need to warm up every email address or just new ones?

Not necessarily. You typically need to warm up new email accounts or existing ones that haven't been used for a while. If an email account is regularly used and has a good sender reputation, additional warming isn't usually required.

  • What are the common mistakes to avoid during email warmup?

One of the most common mistakes is rushing the process. Email warmup should be gradual. Another mistake is sending emails to unverified or non-existent addresses, which can harm your sender's reputation. It's crucial to clean your email list before starting the warmup process.

  • Can email warmup help improve open rates and engagement?

Absolutely! A well-executed email warmup process can significantly improve your email deliverability, which in turn boosts your open rates and engagement. By warming up your emails, you're essentially building trust with ISPs, increasing the chances your emails will land in the recipient's inbox.

  • Is there a difference between warming up a personal email address and a business email address?

While the process is similar, the main difference lies in the volume of emails sent. Business email addresses often send a higher volume of emails compared to personal ones; hence, they might require a longer warmup period.

  • Are there any risks or downsides to email warmup?

The only real risk is if the process isn't done correctly. For example, sending too many emails too quickly can trigger spam filters. However, if done correctly, email warmup can significantly improve your email deliverability and campaign success.

Always remember that email warmup is an ongoing process - it doesn't stop once your emails start hitting the inbox. Regular engagement with your email list is crucial to maintain a healthy sender reputation.

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How to customize formatting for each rich text

Headings, paragraphs, blockquotes, figures, images, and figure captions can all be styled after a class is added to the rich text element using the "When inside of" nested selector system.

Author’s Details

Arpan Sarma

I am a seasoned Digital Marketing Specialist and the Senior Content Writer at Smartlead. I collaborate with fintech, SaaS and technology companies and help them become thought leaders, generate more revenue and scale ahead of peers with actionable and data driven marketing strategies.


Edited by:

Arpan Sarma


Frequently asked questions

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.

How does the "unlimited mailboxes" feature benefit me?

Email automation FAQs- Smartlead

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.

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

Email automation FAQs- Smartlead

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 I integrate Smartlead with other tools I'm using?

Email automation FAQs- Smartlead

Certainly, Smartlead 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!

Email automation FAQs- Smartlead

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 multi-channel infrastructure is 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.

Email automation FAQs- Smartlead

Do you provide me with lead sources?

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 humanized email sending patterns and ramping up the sending volume. 

5. Multi-Channel Emphasis: Smartlead places a strong emphasis on multi-channel outreach. You can reach your prospects where they are with the LinkedIn outreach feature.   With Smartlead’s cold email automation software, you're always one step ahead in your outreach efforts, enjoying the freedom to scale your initiatives and seamlessly integrate with other tools—all while maintaining a focus on maximizing the impact of your outreach.

Email automation FAQs- Smartlead

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?

Email automation FAQs- Smartlead

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!

How can I reach the Smartlead team?

Email automation FAQs- Smartlead

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.

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