My Honest Review of 11 Best Email Warmup Tools for Cold Outreach

50% of your cold email success depends on one thing— email deliverability.

Email warm-up tools automate the process of gradually increasing an email account’s sending volume and maximizing its deliverability!

I’ve tested 11 of the best warm-up tools for 3 weeks and put together an in-depth review of each one, including their results.

See how they performed!

Email Warm-Up Tools Put to the Test: Here’s What I Found

No fluff, just real results!

I put 11 popular email warm-up tools to the test over 3 weeks, sending 50 emails each week with every tool – why?

• So you don’t have to waste time and money testing them all
• To see which ones actually improve deliverability

🥁 Results Decelared🥁

My In-Depth Review of the 11 Best Email WarmUp Tools

I’ve already shared my results with these tools; now, I’ll walk you through my experience with each one so you know exactly what to expect.  

1. TrulyInbox
2. Warmy.io
3. WarmUp Inbox
4. Mailivery
5. Lemwarm
6. Mailreach
7. Folderly
8. Allegrow
9. Mailwarm
10. InboxAlly
11. Warmbox

Let’s get into the details!

1. TrulyInbox 

TrulyInbox is a simple warm-up tool. 

But! 

It excels at its core job, i.e., getting your emails into the inbox and maintaining optimal deliverability rates!

TrulyInbox has no complex  features; it is a laser-focused tool optimized for deliverability.

It gradually increases your sending volume over time, mimicking natural human email behavior to help build a positive reputation with email providers.

My Favourite Feature 😃: Never Pay Per Mailbox

TrulyInbox allows you to warm up unlimited email accounts without any additional cost. 

Once you log in, it walks you through all the steps to set up your email accounts. The setup is super easy with multiple connection options: SMTP, Native Microsoft integration, and Google OAuth.

What do Users Have to Say?

“TrulyInbox really helps when it helps with email management. I love its simple and user-friendly design, it helps me to focus on what matters. Replies are humane, it makes the communication and connection much much better and efficient.”  Read the full review on G2 

2. Warmy.io

Warmy is an AI-driven email warm-up tool.  

To provide the best email warmup service, it offers automated warm-up with the help of “Adeline,” the AI engine.

My Favorite Feature 😃: Template WarmUp 

For me the standout feature of Warmy.io has to be the ability to add your template to the warm-up process.

By using this feature, you can make the email template part of the warm-up process and improve the deliverability of a single email template. 

Moreover, I really liked their deliverability insight capabilities as they helped me to make smarter decisions to optimize my outreach strategy.

What do Users Have to Say? 

“Warmy is a reliable tool that delivers on its promises. It helps improve your email deliverability, which is crucial for successful email marketing. I send emails every day with it, and I’m getting good results. They have a free trial, too, which is how I got started.” Read the full G2 review

3. WarmUp Inbox

WarmUp Inbox is the next email warm-up tool I tried.

It uses a network of over 30,000 real inboxes to warm up your emails (which is quite impressive)

My Favorite Feature 😃: ESP Warmup Tool

But what really impressed me was their ESP Warmup feature. 

I used it to warm up my Gmail accounts, and I saw a clear improvement in deliverability. Before using it, a lot of my emails sent from those accounts were ending up in spam. 

However, after the warm-up, more of them started landing in inboxes. 

It works by boosting engagement and building trust with ESPs over time—something that’s hard to get right on your own.

What do Users Have to Say?

“Cleared up all deliverability mysteries. I finally get it! Plus, it made the technical aspect of doing it all so easy to implement. Makes a big difference.” Read the full review on G2

4. Mailivery

Another tool that provides the best email warm-up services is Mailivery.

It uses a solid AI algorithm to remove your emails from spam and positively replies to them to improve your deliverability in real time. 

My Favourite Feature 😃: Customizable Intelligent Sending Behavior

You can customize the volume and timing of your email warm-ups so that you can set the right limits as per your strategy to ensure maximum deliverability.

That said, it also offers advanced settings like you can, set time zones, weekend sending, custom signatures, unique email identifiers, etc.

What do Users Have to Say?

“Mailivery’s email warm-up tool leverages AI and real conversations to enhance sender reputation and beat SPAM algorithms.” Read the full review on G2

5. Lemwarm

Lemwarm is one of the best email warm-up and deliverability tools in the market that uses a warm-up network of 20K+ healthy domains.

My Favorite Feature 😃: Email Deliverability Test

It helps you send a test email from your email account to a list of test inboxes that Lemwarm provides to see where your emails are landing in the primary, spam, or promotional folder. 

You also get a deliverability report showing your inbox placement rate across different email providers (like Gmail, Outlook, Yahoo, etc.).

What do Users Have to Say?

“The best thing is their Lemwarm feature for warm-up activity.”  Read the full review on G2

6. MailReach

MailReach is an email warmup tool built to optimize inbox placement.

It has a smart and complex warming algorithm that works behind the scenes to improve the deliverability of your email accounts.

My Favorite Feature 😃: AI Deliverability Assistant

Its AI assistant identifies issues like:

• SPF, DKIM, and DMARC email setup
• Analyze your inbox placement
• Detects reputation issues

The assistant suggests fixes based on the issues it finds and gives recommendations to improve deliverability, like adjusting sending volume, warming up your domain, or tweaking email content.

This was super helpful as it allowed me to detect roadblocks ahead of time and optimize accordingly.

What do Users Have to Say?

“MailReach automates the process of sending emails to your receiver, and the learning curve is minimal. You just need to sign up, choose a plan, connect your email address, and start with warm-up emails to test the best strategy to reach your targets.”- Read the full review on G2

7. Folderly

Folderly is an advanced email warm-up tool.

With it, you can easily track and improve your warm-up email efforts.

My Favorite Feature 😃: Monitoring Feature

 The real value is in its ability to find and fix deliverability problems, which makes sure that your emails always get to the right people.

But Folderly is charging $96/mailbox/mo (when billed annually), which I think is too much for just warming up an email account! 

There are many other tools in the market that offer much more than just email warm-ups, like outreach features, at the same price tag! So, I think you better invest in an outreach tool that offers much more than just email warm-up.

What do Users Have to Say? 

“I like how Folderly makes email deliverability easy to manage. The tool gives clear insights and actionable tips, helping to keep emails out of spam folders. The interface is intuitive, so setting up and monitoring campaigns is quick and straightforward.” Read the full review on G2

8. Allegrow

Another email deliverability software that I tested was Allegrow. 

I really liked their testing feature. Almost all the warm-up tools in my list have this feature, but Allegrow’s deliverability feature differs by process. 

It sends test emails to B2B inboxes which have unique postmasters, and gives the accurate percentage of your emails landing in spam folders vs. the primary inbox.

My Favorite Feature 😃: Safety Net

This feature helps to automatically pause the emails that will hurt your company’s sender reputation.

What do Users Have to Say?

“Allegrow has been very easy to use, integrating more users as the team grows. Prevents at-risk emails and has really done an excellent job at improving our email deliverability.” Read the full review on G2

9. Mailwarm

Mailwarm is a basic email warm-up tool. 

It has 1000+ real inboxes that interact with your email accounts by opening them, taking them out of the spam folder, marking them as important, and giving a reply. 

These great interactions make your sender’s reputation stronger.

My Favorite Feature 😃: Dashboard Monitoring 

You can easily track and control your warm-up efforts from a single dashboard. It gives you insights into your daily activities so that you can either scale the email sending volume or pause when needed.

What do Users Have to Say? 

“It warms up our inboxes in 2 weeks and helps us deliver outbound to our target prospects. Without it, our emails would not have been properly delivered, and our domain would have been hurt.” Read the full review on G2

10. InboxAlly

InboxAlly is an email warm-up tool that has advanced engagement features. 

Other warm up tools have basic engagement features where they reply and move emails from spam.

 But InboxAlly has an advanced engagement feature like “Click Link” where the links present in the warm-up emails are automatically opened. 

This action demonstrates not only interest in the content but also builds trust among ESPs.

My Favorite Feature 😃: Auto-Scrolling Action

It automatically scrolls down on your longer warm-up emails, which sends high-value engagement signals to ESPs.

What do Users Have to Say?

“With the help of this tool, I have been able to increase the deliverability of emails on any IP or domain on any platform with huge success.” Read the full review on G2

11. Warmbox

Warmbox allows you to warm up email accounts from 10+ ESPs. 

It allows you to improve your email deliverability with a network of 35,000 inboxes with GPT-4 generated warm-up emails. 

My Favourite Feature 😃: Customizable warm-up options

You can customize the email volume, sender reputation, reply rate, and targeted audience for your warm-up campaign. 

What do Customers Have to Say?

No reviews on G2

Final Verdict!

Well, it’s just email warm-up. 

(It is very important, but it should not take much of your time and effort)

It should run on AUTOPILOT.

If you are still reading this and are not sure which email warm-up tool to opt for, I suggest you go for TrulyInbox.

Why? Because it is good at its job (i.e., warming up emails) and is natively integrated with Saleshandy.

All you have to do is – connect your email account with TrulyInbox in Saleshandy and forget about it. 

FAQs on Email Warm-Up Tools

1. What Is the Best Email Warmup Tool?

Based on my research and testing of various email warm-up products, I can say that TrulyInbox is one of the best email warm-up tools. Here’s why:

• It re-creates human behavior like opening, replying, marking as important, starring, etc.
• The email accounts used for sending warm-up emails are from a verified network of real users who have opted in.
• You can easily add email accounts from Google and Microsoft using oAuth and other providers using SMTP settings.
• Finally, it integrates seamlessly with Saleshandy–an AI-assisted cold email automation platform. So you can warm up your emails and immediately start reaching out to prospects.

2. How Do You Warm Up Emails?

There are 2 ways to warm up your email accounts: The manual, time and effort-consuming way and the more efficient option—using an email warm-up tool. 

3. How to Warm Up an Email for Free?

The only way you can warm up your email accounts for free is by doing it yourself. And let me tell you, the manual route is very time and effort-consuming. Your best bet is to rely on email warm-up tools like TrulyInbox, Lemwarm, etc.

4. Is Email Warmup Legal?

Of course, it is legal! And the best way to make sure it stays that way is to warm up using an email warm-up platform.
These tools operate within a network of verified users who have consented to receive and engage with warmup emails.
This way, the entire warm-up process remains compliant with privacy laws like GDPR, CAN-SPAM, etc.