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12 Best Email Warmup Tools in 2023

Updated: Oct 23

Any experienced email marketer knows that for a successful cold email campaign, you need to warm up your inbox first.

Warm up process helps you increase your email reputation right from the beginning as well as increase the deliverability of your campaigns.

To properly warm up your email accounts (or your whole domain) you need to use one of the email warmup tools that can interact with your inboxes and slowly ramp up your reputation.

In this article, we will take a look at the top 12 best email warmup tools, their pros and cons, and answer a few important warmup questions such as:

What is an email warmup tool?

The email warmup tool is a service that improves your email deliverability by preparing the inbox for future email campaigns.

Email warmup consists of various actions (e.g. sending emails, opening and replying to messages, etc.) that gradually “warm up” the account so the spam filters will consider its emails reliable and trustworthy.

List of the best email warmup tools (in 2023)

  1. Warmup Inbox

  2. Mailwarm

  3. GMass

  4. Mailreach

  5. Lemwarm

  6. Warm Up Your Email

  7. Folderly

  8. Reply

  9. InboxWarm

  10. Warmbox

  11. Woodpecker

  12. Autowarmer

1. Warmup Inbox

Warmup Inbox Tool

Warmup Inbox is an email warmup service that can help you increase the deliverability of your campaigns and improve the reputation of your email account over time.

The tool provides a network of more than 20,000 real inboxes that your email account can utilize for the warmup process.

Warmup Inbox is pretty easy and straightforward to use - after you sync your inbox with the platform, the tool will start to interact and engage with your account.

This process includes tasks such as replying to your emails, marking them as important, pulling them out of the spam folder, etc.

Besides the basic warm up process, the Warmup Inbox also offers many other useful features, such as:

  • monitoring the sender's reputation

  • alerting you about any issues with your reputation

  • checking the spam rate of your emails

  • checking whether your email is present on any blacklist

The setup of the email account is pretty easy and straightforward - you can simply sync your inbox into the Warmup Inbox platform and the tool will automatically start communicating with its network of real users.

Warmup Inbox works with all major providers, such as Gmail, Yahoo!, Outlook, Zoho, and many many others.

A very nice perk of this service is an excellent customer support. It consists of specialists in the warmup field that can help you with any problem that you might encounter.

Warmup Inbox offers its services for a very fair price: only $12 per inbox/month (with an annual plan).

You can also try the free trial version for 7 days (no credit card needed).



Easy to use

Lack of AI content

Network of real inboxes

Very affordable

Detailed reports and monitoring

Great customer support

Free trial version

Tip: Besides our email warmup tool, you can also try our free email spam tester to quickly check the spam score of your email as well as its inbox placement before sending it to real users.

2. Mailwarm

Mailwarm Tool

Mailwarm is a pretty easy and straightforward tool to use: once you set up your email account for the service, Mailwarm will simply start sending and replying to your emails and gradually warm up your account.

One of the nice features of this tool is that you can set up your own schedule for the warmup process and control when the inboxes should automatically start sending and replying to emails.

Besides the warmup schedule, Mailwarm also performs other actions within the inbox such as retrieving emails from the spam folder, marking emails as “important” and opening up incoming emails.

Although Mailwarm is a pretty nice and neat warmup tool, it can get a little bit expensive: The “Starter” package for 1 email account costs $69 / month, and for the 10 registered accounts (in the “Scale package") it can get up to $479 / month.



Creating automatic engagement

Quite expensive

Easy to set up

Personalized emails

3. GMass

GMass Tool

GMass is a service that, among other interesting things, also provides a decent email warmup tool.

GMass actually offers 8 useful tools that are all heavily focused on Gmail (since the company wants to serve as an all-in-one solution for the Gmail provider).

With GMass, you can monitor the reputation of your domain, check out statistics about your opening rate or even start a massive cold email campaign.

However, this huge email conglomerate has its limitations - since the GMass is all about Gmail services, it might not work so well for people who need to warm up their email accounts for other email providers.

Although the warmup service is free (for 50 emails sent per day), the price for all other eight services starts at $19.95/month (Standard plan) and can get up to 49,95$ / month (Enterprise plan).



8 email-specific services

Works only for Gmail provider

Detailed warm-up reports

Interaction with real email accounts

4. Mailreach

Mailreach Tool

Mailreach is a standalone email warmup tool that was designed by a French company in 2020.

The tool is very easy to use - once your inbox is set up and connected to Mailreach, it will automatically start sending and replying to emails.

Besides the generic warm-up, it also provides a few interesting features such as:

  • Testing the emails and evaluating your spam score

  • Checking your email accounts in blacklists

  • Detailed deliverability reports

A small downside (at least to some people) is that Mailreach email replies are not generated by real people (so they might seem a little suspicious to ESPs in some cases).

On the other hand, this tool comes with a reasonable price: it starts at $25 / inbox.

You can also get custom pricing in case you would like to warm up a huge number of email accounts simultaneously.



Easy to use

Network contains fake accounts

Detailed warm-up reports

Blacklists monitoring

5. Lemwarm

Lemwarm is a well-established (though a little bit old-school) email warmup tool - it was the first email warmup service that ever appeared in the market.

Lemwarm allows you to control the exact number of warmup emails that you would like to send from your inbox every day.

Once you set up your account and start the warming process, the tool will automatically start sending emails on your behalf within its network of inboxes (and create replies generated by real people).

Lemwarm pricing starts at $25 / month / 1 inbox.



Easy to use

Some limitations in the UI

Detailed warm-up reports

Network of real inboxes

6. Warm Up Your Email

Warm Up Your Email is a warm up tool that was acquired by Mailshake in July 2021.

The tool offers a unique feature that stands out from its competitors - Warm Up Your Email uses a team of real people that try to positively interact with emails so your email reputation can improve more naturally.

It also provides a clear spam score for its users which indicates how often the emails ended up in the spam folder or how much has your inbox already “warmed up”.

The tool can be connected to all major email clients (e.g. Gmail, Outlook, Amazon, Mailgun, etc.).

Warm Up Your Email is a paid tool that starts at $29 / month / 1 email account.



Email interaction is done by real people

A limited set of features

Detailed reports

7. Folderly

Folderly is an AI-powered email deliverability service that focuses on more than just the warm-up process.

It uses machine-learning systems that help email inboxes to interact with emails like real people would do - by creating and replying to emails with meaningful content, opening, marking, and interacting with messages, etc.

Besides the generic warm-up process, Folderly also offers to run huge email outreaches and email analyses for companies that need more than just properly warmed up inboxes.

Unfortunately, this interesting piece of software is quite costly: The pricing starts at $49/month and gets higher for the more premium features.



AI-powered platform

Quite expensive

Detailed reports

Easy to use

8. Reply

Reply is an all-in-one sales engagement platform that happens to also provide a simple warmup addon.

Reply’s Email Warm-Up tool is based on a network of real inboxes that communicate with each other - it utilizes peer-to-peer sending without any free or temporary email accounts and therefore it makes the warm-up process safe and reliable.

With this network of users, Reply can create a positive engagement by interacting with your emails - it opens and replies to your emails or marks them as important (which can gradually improve your email reputation).

Unfortunately, the warmup tool is available only for Outlook and GSuite.

Reply’s Email Warm-Up fee is $29 / month / 1 email account that can be billed monthly or annually (depending on your pricing plan).



Network of real inboxes

Available only for GSuite and Outlook

Detailed reports

14-day free trial

9. InboxWarm (by OutreachBin)

InboxWarm is an email warm up tool that is part of OutreachBin's platform.

The tool uses an advanced algorithm that ensures human-like interaction with emails within its peer-to-peer network of users.

Once you connect your email account to OutreachBin's platform, the inbox will become part of its network and starts gradually improving its reputation by communicating with other accounts.

InboxWarm is very user-friendly and can be easily used even by absolute beginners.

Although the service claims that you can warm up your account in only 2 weeks, it also recommends to continue warming up your account in order to maintain your email reputation high.

OutreachBin works with every major email provider - whether it is GSuite, SendGrid, Amazon, Outlook, etc.

The pricing of OutreachBin starts at $19.97 / month / 1 email account (with an annual subscription).



Human-like email activity

No free trial

Easy to use

Works with all major email providers

10. Warmbox

Warmbox is a standalone warm-up tool that can increase your email reputation by automatically sending emails from your account and by interacting with them.

Similarly to other popular warm up tools, Warmbox uses its private network of more than 35,000 inboxes that communicate with each other and gradually increases the reputation of each email account connected.

One of its special features is its GPT-3 AI algorithm for each inbox that helps to generate and send unique emails between each other (and therefore create natural conversations between accounts).

It also provides detailed monitoring tools and analytics that can show you reports about your reputation and overall warm-up progress.

Warmbox charges $15 / month / 50 emails created per day.



AI-powered content

No free trial

Works with any major email provider

Blacklist monitoring

Detailed reports

11. Woodpecker

Woodpecker offers for its users a free warm-up tool that is included in the subscription for its whole service.

The setup for the warm-up process is very easy and straightforward - all you need to do is to be connected to the platform and turn on the warm-up process with just one click.

You can also choose whether you would like to warm up your whole email domain or just one email address that you are planning to use for your campaigns.

Woodpecker does exactly what you would expect from a proper warm up tool - it automatically sends warm-up emails, pulls them out from the spam folder, marks them as important, etc.

Besides ramping up your email reputation, you can also use Woodpecker to recover your reputation if it starts to decrease or simply to keep your deliverability high all the time.

Although the warm up tool is free for Woodpecker users, the subscription itself for the platform starts at $40 / month (with an annual plan).



Easy to setup

Price for the whole service

Part of the platform

Detailed reports

12. AutoWarmer (by QuickMail)

AutoWarmer is a warm up tool that is integrated into QuickMail’s email platform.

The tool can improve the sender's reputation by creating positive engagement with your inboxes - it auto-replies to your emails from its network of inboxes, pulls the emails out of the spam folder, and slowly increases the reputation of your email account.

A nice feature of the AutoWarmer is that it is capable of generating emails that contain business language that you would usually use on a daily basis.

Autowarmer claims that it can improve your domain reputation within the first 1 - 2 weeks (as opposed to a regular warm-up process that may take between 3 to 4 weeks).

The tool offers a free version for 50 inboxes per account (for Gmail, Outlook, and SMTP email clients) and starts at $59 / month with 500 emails sent / inbox / day.



Free version

Not very user-friendly

Detailed warm-up reports

Auto Archive

Email warmup tools - price comparison

Email Warmup Tool


Warmup Inbox

$12 / month (annual plan)


$69 / month (annual plan)


Free (for 50 emails per day)


$25 / month


$50 / month (annual plan)

Warm Up Your Email

$29.00 / month


$49 / month


$29.00 / month




$15 / month (annual plan)


$40 / month (annual plan)


Free (up to 50 inboxes per account)

Why is an email warmup tool important?

Email warm-up tool saves a lot of time - it will gradually warm up your inboxes so you can use them for your email campaigns in the future.

Although you can warm up your inbox manually, it takes a lot of time and effort since you would have to frequently use your email accounts, send emails from them, and reply to messages on a daily basis.

Besides the warm-up process, it is important to understand that your email account won't stay “warmed up” forever - if the inbox stops being very active, it will gradually start losing its email reputation.

Email warmup tools solve both of these problems as they can automatically warm up your inboxes and keep them constantly prepared for you.

How long should you use an email warmup tool?

The short answer - you should be warming up your email accounts constantly.

Email warmup is a never-ending process: in order to keep a positive email reputation, you need to keep your inboxes “warmed up” all the time.

Email reputation can be improved after a few weeks of using a proper warm up tool, however, this reputation starts to decrease if your inbox becomes inactive.

Or in other words - the longer you let your inbox inactive, the more reputation it will lose.

Therefore, it is recommended to keep your email account synced with one of the warmup tools even after the initial warmup process so you can maintain a good email reputation and high deliverability all the time.

Start landing in more inboxes. 
Use Warmup Inbox to improve your sender reputation and increase your deliverability.

No credit card needed!

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