Top 9 Email Warm-up tools to land in the inbox in 2026

Top 9 Email Warm-up tools to land in the inbox in 2026

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WHAT IS EMAIL WARMUP?

Email warmup is the process of gradually increasing the volume of emails that are sent from a new or recently established email account to establish a positive sending reputation and improve the likelihood that emails will be delivered to the recipient's inbox.

When a new email account is created, it typically has no sending history or reputation. Email service providers (ESPs) such as Gmail, Yahoo, and Outlook may be more likely to flag the emails as spam or send them to recipients' junk folders. By sending a small number of emails initially and gradually increasing the volume over time, the ESPs will begin to recognize the sender's IP address as a legitimate source of email and thus improving the deliverability rate.

The warmup process usually begins with a low volume of emails, such as 10-50 emails per day, and then slowly increases the volume over a period of 1-2 weeks or longer, depending on the specific strategy. Along with the volume increasing, the email frequency can be improved by sending messages at different times of the day, with different subject lines, and to a diverse group of recipients.

The warmup process is vital for professional emailers like sales teams & email marketing teams, as a high deliverability rate ensures that the email campaigns reach the right inbox and can boost overall efficiency.

WHY DO YOU NEED TO WARM-UP YOUR EMAIL INBOX?

Warming up an email inbox is essential because it helps ensure that emails sent from a new or recently established email account will be delivered to the recipient's inbox.

It is imperative to protect the sender's reputation. Sending a high volume of emails from a new account immediately may be seen as suspicious behaviour and can result in the account being flagged as a spammer. This can lead to all future emails being blocked, which can damage the sender's reputation and lead to loss of business or communication.

WHAT DOES AN EMAIL WARM-UP SOFTWARE DO?

An email warmup software is a tool that helps automate the process of warming up an email inbox. It typically works by allowing users to set up an email account and then gradually increasing the volume of emails that are sent from that account over a period of time.

Email warmup software usually has features such as:

• Automated sending: It schedules the emails to be sent automatically according to the set warmup schedule.
• Customizable sending schedules: It allows users to set their own warmup schedule based on the number of emails sent per day and the time frame over which the emails will be sent.
• Sending limits: It imposes daily limits on the number of emails that can be sent, so users can't send too many emails at once and risk being flagged as spam.
• Email tracking: It allows users to track and monitor the deliverability rate of their emails and adjust the warmup schedule as needed.
• Email personalization: Allows users to personalize the content of their emails with different subject lines and messages.
• ESPs integrations: Some software also supports integration with different ESPs to warm up accounts with different providers.

An email warmup software ensures that emails sent from a new or recently established email account will be delivered to the recipient's inbox and help maintain a positive sending reputation. It eliminates the need for manual scheduling and monitoring, making the process more efficient and less time-consuming.

TOP EMAIL WARM-UP TOOLS IN 2026

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1. INSTANTLY

Instantly is a lead generation software with advanced email warmup capabilities that go above and beyond traditional warmup tools. It uses a vast deliverability network of over 1,000,000 real email accounts to gradually introduce and warm up your domain.

It warms up your accounts by initially sending at least two customizable warm-up emails, then progressively increasing the number of emails sent over time. This ensures your sending behavior mimics human activity, enhancing your sender reputation, protecting your domain, and avoiding spam filters.

This tool provides a deliverability dashboard that shows your deliverability score and the percentage of emails ending up in inboxes versus spam folders. By knowing when your emails need more warm-up time, you can adjust your strategy to achieve better results.

If you’re new to all this, don’t worry. Using this tool is simple, you don’t need to set up various configurations. It just needs one click to activate the deliverability network for your connected email accounts.

If you’re an experienced user, the advanced settings are for you. You can enable read emulation to simulate human interaction with your warm-up emails. You can even customize the open rate, response rate, and spam protection settings for a fully personalized warm-up process.

With Instantly, you'll never be limited by the number of inboxes you can warm up, giving you the flexibility to scale your efforts as needed.

There is no need to settle for just an email warmup tool if you want a solution that encompasses several aspects of your outbound sales process.

Pricing: Instantly has a free trial and premium plans start at $37/mo

Rating: Instantly is rated 4.9/5 on G2 (2,638 reviews)

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2. LEMWARM

lemwarm is a built-in tool within lemlist, a well-known sales engagement and automation software.

lemwarm automatically warms up your email address by sending emails to a premium network of 10,000 users. This boosts your email domain's credibility, keeping you out of the spam folder and enhancing your overall email performance.

lemwarm simulates human-like email interactions, gradually increasing your sending volume while monitoring your deliverability score. It has a real-time monitoring and alert system that notifies you of any potential spam risks and provides detailed insights into your email deliverability.

If you’re already a lemlist user, don’t miss out on using lemwarm. In this way, you save money on an email warmup tool (since lemlist integrates it for free if you pay for their sales automation software) and you save time in integrating the tool within your stack (since both the sales automation and email warm-up features are integrated into one platform).

Pricing: lemlist has a free trial and premium plans start at $39/mo

Rating: lemlist is rated 4.6/5 on Capterra (380 reviews)

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3. WARMBOX

Warmbox is an excellent email warmup tool that can help improve your deliverability and protect your sender's reputation by gradually increasing your email sending volume over time.

Like most warm-up tools, It simulates interactions between your inbox and other inboxes, removes emails that land in spam folders and marks them as safe, thus sending a positive signal to email platforms that increases the chances that your emails will be delivered to the primary inbox.

It also offers a deliverability checker and integrations with almost all ISPs. To stay clear of spam traps, use this free spam checker and keep your emails clean.

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Warmbox is a very affordable option, pricing starts at $15/month, and has a subscription-based pricing model, which decreases as you scale to a more significant number of inboxes. It's a very effective and easy-to-use option that has received positive ratings and reviews from G2 and Capterra.

Warmbox stands out from most of the competition because of its automation, deliverability checker, low pricing and its wide range of ISP integrations.

4. SMARTLEAD

Smartlead is not a traditional email warmup tool, but it is still be a good option for warming up your email inbox. Smartlead is a lead generation software that helps businesses to find and connect with potential customers.

On top of its sales automation features, Smarlead has email warmup capabilities and has no limits in the number of inboxes you can warm up. If you’re looking for warming up your inbox specifically, other options might be more appropriate. In the case you’re looking for a all-around tool that also allows you to warm-up your inbox, Smartlead is a great option to consider.

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5. WARMY

Warmy stands out as a leading email warm-up tool, offering an all-in-one solution to enhance email deliverability and ensure your messages reach recipients' inboxes. With its innovative AI-powered processes, Warmy automates the warming up of mailboxes, optimizing them for email marketing campaigns.

By analyzing numerous parameters daily and engaging with real individuals on your behalf, Warmy's AI engine, "Adeline," actively improves your sender reputation, ensuring consistent inbox placement for every email you send.

One of Warmy's key strengths lies in its full progress monitoring capabilities, providing users with clear and transparent insights into the warm-up process. From Email Deliverability Checker to Email Health Checker and Email Template Checker, Warmy equips you with the necessary tools to refine and enhance your email campaigns' success rates.

By automatically opening messages, marking them as important, and steering them away from spam folders, Warmy ensures optimal email activity, significantly boosting your sender reputation.

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6. MAILREACH

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Mailreach is, by far, the best email warmup software in the market, it offers fully automated warmup, up to 90 emails per day, deliverability score and integrations with major ISPs.

It simulates interactions between your inbox and other inboxes, and every time an email lands in the spam folder of the recipient, the software will remove them and mark the message as NOT spam, this sends a positive signal to email platforms, which leads to the emails landing in the primary inbox.

Additionally, it provides an email spam tester that you can use for free and helps evaluate the likelihood that your emails will be flagged as spam. Its pricing is subscription-based, per inbox or email account, that decrease as you scale to a higher number of inboxes.

Other email warmup software may offer similar features, but Mailreach's approach, performance and success rate are unmatched, making it the best option for ensuring that your emails land in the primary inbox and boost your deliverability rate.

Mailreach’s team wrote an outstanding guide on email deliverability. They are experts on the subject, thus, don’t hesitate to read it if you want to know everything about landing in the primary inbox.

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7. WARMUPINBOX

Warmupinbox is the most cost-effective solution for warming up your email inbox. With its subscription-based pricing model starting at just $12/month, it offers a budget-friendly option for businesses looking to improve their email deliverability and increase the chances of their emails reaching the primary inbox of recipients.

Warmupinbox offers a range of key features including the gradual warming of multiple email accounts, automated warm-up process, and compatibility with most ISPs.

It's a great option for businesses looking for a budget-friendly solution to warm up their inbox and ensure their emails reach the intended recipients.

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8. MAILWARM

Mailwarm is an email warmup software that helps businesses improve email deliverability by simulating interactions between your inbox and other inboxes, ensuring your emails land in the primary inbox of the recipient. It offers a subscription-based pricing model with plans starting at $69/month.

Despite being efficient in warming up your inboxes, I would recommend NOT to use Mailwarm for one main reason: Mailwarm is more expensive than other email warm-up solutions on the market. There are many other options that have similar features and capabilities, but at a lower cost.

9. UNFILTERED.AI

Unfiltered.ai covers all angles of email deliverability with a boost of AI. Optimize your sender's reputation, open rates, and improve your email health score - all in one place. They are email deliverability experts, so rest assured that you're utilizing top-notch technology for sending emails at scale, including cold emails, email marketing, newsletters, and more.
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Advantages:

• You can start with the free-7-day-trial to test if Unfiltered.ai is a good fit for your needs.
• Unfiltered.ai uses the most up-to-date tech to prevent your emails from ending up in the spam folder.
• Need help with setup? Unfiltered.ai got you covered with comprehensive guides and 1-1 support!
• Personalize your emails with your own text. Write your message, and let the AI handle the rest.
  

CONCLUSION

In conclusion, email warm-up is an essential process for professional emailers such as sales and email marketing teams.

It helps establish a positive sending reputation and improves the deliverability rate of emails.

Email warm-up software automates the process of warming up an email inbox, allowing for efficient and less time-consuming scheduling and monitoring. Features such as automated sending, customizable schedules, sending limits, email tracking, and personalization, as well as integration with different ESPs, are important considerations when choosing an email warm-up software.

In the end, it is up you to decide on the solution that fits best your need. My personal recommendation are to use Mailreach if you’re looking for a solution that is focused on email warmup only. In the case you’re looking for both sales automation and email warmup features, Smartlead is a great choice.

FAQ

Q: What is email warm-up?

A: Email warm-up is the process of gradually increasing the volume of emails sent from a new or recently established email account to establish a positive sending reputation and improve the likelihood of emails being delivered to the recipient's inbox.

Q: Why do you need to warm up your email inbox?

A: To ensure that emails sent from a new or recently established email account are delivered to the recipient's inbox and to protect the sender's reputation.

Q: What does an email warm-up software do?

A: An email warm-up software automates the process of warming up an email inbox by gradually increasing the volume of emails sent over a period of time, tracking deliverability rates, and offering other features such as automated sending, customizable schedules, and personalization.

Q: What are some features of an email warm-up software?

A: Automated sending, customizable sending schedules, sending limits, email tracking, email personalization and ESPs integration