6 Best Email Deliverability Tools for 2025

Disclaimer: this is not another bullshit list article (but there’s still a list, valuable).

Before going further, it is important to specify that, in this article, we won’t list the email deliverability tools that we’ve never tested.

We also won’t list email deliverability tools that we have received bad feedback on.

This article aims to help you get better results from your emails by using the right email deliverability tools, period.

Having said that, we’ll name a few good solutions, only the ones we know can have a positive impact on your email campaigns.

What is a good email deliverability tool?

A proper email deliverability tool helps you measure your deliverability with reliability and accuracy.

First, you can’t improve what you can’t measure.

Second, most email deliverability tools who claim to measure your deliverability are biased and not reliable to give you an accurate result. And that’s a problem.

We won’t name and trash our competitors in this article but here’s one BIG thing you need to know.

The only reliable way to test your deliverability meets these criteria :

• The test is done by directly sending your email to a list of inboxes, not only one (even if it forwards to a list of inboxes).
• This list must reflect the type of inboxes you really target.

Unfortunately, there’s not many email deliverability tools who meet these important criteria. You’ll see that below.

An efficient email deliverability tool should help you improve your deliverability.

Once you’ve properly tested your deliverability with accuracy and without bias, you can now improve it.

Keep the following equation in mind :

Good deliverability = good sending reputation + not spammy content + not spammy sending setup.

About testing and improving your reputation

Your reputation is mostly influenced by how your recipients react to your emails.

If you get a lot of openings, positive replies, people starring your emails, removing from spam, you’re very likely to have a good reputation.

If you don’t get enough positive interactions and worst, a significant portion of your recipient mark your emails as spam, you’re very likely to have bad reputation, sooner or later.

Among email deliverability tools, using a good email warm up tool will help you monitor and raise your reputation. We’ll cover that below.

About checking the spamminess of your email content

You can have the best sending reputation on earth and still land in spam because of the content of the emails you send.

One URL can screw your deliverability. The tracking domain is one of the first causes of content related spam for instance.

Wording too. Today, any word can be a spam word. You don’t have to talk about Viagra, Money or Trading to land in spam because of some words.

Images too, etc.

Checking your email content and identifying spammy elements can be done by using good email deliverability tools.

About checking the spamminess of your sending setup

Some ways of sending emails are much more likely to land in spam than others.

For a cold emailing use case, the best for email deliverability is to send from Google Workspace mailboxes. Second is Office 365.

Why? Because that’s the most human way to send emails.

For promotional / newsletters / transactional emails, you’re very likely to use tools such as MailChimp, Sendinblue, SendGrid, Mailgun and so on. And Custom SMTPs (usually the worst for deliverability as it’s too exotic).

When using these, one or several IP addresses will be used to send your emails and an IP alone can cause spam if the IP reputation is damaged.

This is why using good email deliverability tools should help you test that.

Top 3 tools to TEST your email deliverability in 2025

#1. MailReach’s Spam Test : Free, Helpful, Reliable and not biased.

MailReach’s Spam Test has been created and fine-tuned following a clear mission : provide a reliable email deliverability test that helps you find out your inbox placement on the major mailbox providers and get truly helpful insights to improve it.

This spam checker aims to fill the gaps of the existing solutions as most of email deliverability tools offering spam testing are not reliable, give biased information and are not so helpful.

How it works - Features

To run a test using MailReach, you need to copy/paste a code inside your email body and then directly send your email to a list of 31 inboxes.

This is the most reliable way to do an email deliverability test.

Once your email is sent, you get a user friendly report with useful pieces of information:

1. Your score out of 10, based on where your email landed. Important : this score adapts based on the type of mailboxes you target.

2. Your inbox placement on 31 inboxes (Gmail, Google Workspace, Outlook, Office 365, Yahoo) : inbox, spam, categories or missing.

3. An analysis of your content : spam words, links, tracking, images, attachments, HTML.

4. An analysis of your sending setup : SPF, DKIM, DMARC, blacklists, domain age, etc.

Pros

✅ Reliable and not biased

✅ Gives a score according to the type of mailboxes you target

✅ Significant number of inboxes : good accuracy

✅ Relevant and helpful checks and insights to help you improve

✅ User friendly

✅ API

Cons

❌ Doesn’t test towards local and very specific mailbox providers. MailReach focuses on the major ones : Google Workspace, Gmail, Office365, Outlook, Hotmail, Yahoo, etc.

Pricing

3 free tests per 24h, no account needed.

Credits packs starting at $12 for 25 tests with discounted pricing for bigger volumes.

Conclusion

Among all email deliverability tools to test and measure your deliverability, MailReach is the most complete and reliable solution.

You can try it for free here : email spam test

#2. GlockApps : Good to test towards a variety of inbox providers, but pay attention.

Of all email deliverability tools, GlockApps is well known.

GlockApps is an inbox delivery and spam filter testing service that helps users find out and fix possible deliverability problems, users get the report of how email is placed across major ISPs, at what Gmail tab the email is delivered and what ISP blocked the message.

How it works - Features

Like MailReach’s Spam Test, you need to copy / paste a code in your email body and then send your email to a list of inboxes.

The size of the list varies according to the categories you choose : Popular US, Business US, Canada, Europe, Russia, Brazil, etc.

Once your email is sent, you get a report that includes :  

1. Your inbox placement results

2. Where your email landed on the different inboxes

3. A content analysis

4. Action steps to improve your deliverability.

Pros

✅ Reliable testing method : directly send your email to a seed list

✅ Good variety of local and specific mailboxes : country, type..

✅ Automatic tests

✅ API

Cons

❌ Only one G Suite (B2B) tested compared to 12+ @gmail.com inboxes (B2C). That means a limited accuracy to test your email deliverability on professional inboxes.

❌ Only one Exchange / Office365 (B2B) tested compared to 12 outlook.com inboxes (B2C). That means a limited accuracy to test your email deliverability on professional inboxes.

❌ No ability to adapt your report based on the type of inboxes you target (B2B vs B2C) as spam filtering is different between the two AND it’s normal to land in spam when sending professional content to personal inboxes.

Pricing

3 free tests (account creation needed).

Plans starting at $10 / month for 17 monthly tests.

#3. Gmass Deliverability Tester : Free, works well but only on Google inboxes.

Originally, Gmass doesn’t belong to email deliverability tools but to email automation tools. It’s a Chrome extension designed to send mass emails from Gmail but they released a spam testing feature to help people measure their deliverability.

How it works

You just have to send your email to a list of 15 Google inboxes and check where it landed.

Your email is not analyzed and you don’t get any report to improve your inbox placement as this tool is only designed to help you find out your inbox placement

Pros

✅ Simple and easy to run. Minimum friction

✅ Quick result

Cons

❌ You can only test your deliverability towards Google inboxes. There’s no other mailbox providers. That’s half of the market.

❌ There’s no report to analyze your email and give you insights to improve your email deliverability.

❌ The results disappear after several hours, you can’t keep track of your deliverability tests and follow your progress.

Pricing

100% free.

Top 3 tools to RAISE your reputation and in turn, your deliverability.

#1. MailReach : Top-notch, efficiency first, user friendly and a team of real deliverability pros.

MailReach, as a solution 100% focused on deliverability, is composed of two email deliverability tools : an email warmer and a spam checker (as seen earlier).

MailReach’s email warm up service is the main service, designed to maximize your sending reputation and in turn, your deliverability.

How it works - Features

First, you have to connect your email account to MailReach.

Once it’s connected, MailReach automatically starts email conversations with human, high reputation inboxes of our engagement network.

The conversations are human and meaningful to build trust with Google and Microsoft.

Most of your warming emails get opened, replied positively, marked as important and removed from spam and categories.

All this positive engagement increases your sending reputation and deliverability. It teaches the inbox providers to send your emails to the main inbox and not in spam.

You can monitor how your reputation is doing by checking your “Where your warming emails land” graph.

What makes MailReach the best solution :

✅ Fully automated – gradual ramp up and autopilot mode

✅ Smart warming algorithm to protect and fix your reputation

✅ Ability to send up to 90 warming emails daily

✅ Engagement network of 12K human, high reputation inboxes

✅ Meaningful warming emails understood by Google & Microsoft

✅ Provider view : monitor your reputation with Gmail / G Workspace VS Outlook / Office 365

✅ All in one solution with the Spam Checker

Pricing

Starter Plan – between 1 and 6 inboxes
$25 per inbox / month ($19.50 per inbox for your first 30 days with current discount).

Scale Plan – for 6 inboxes and more
– Between 6 and 20 inboxes : $19.5 per inbox / month
– Between 21 and 50 inboxes : $18 per inbox / month
– Between 51 and 100 inboxes : $16 per inbox / month
– 101 inboxes and more : contact us

More information on MailReach’s pricing page.

#2. Reply.io’s email warmer : Good solution

At first, Reply.io doesn’t belong to email deliverability tools but as a cold email sending solution with a good reputation in the cold email space. They released their warm up solution in 2021.

How it works - Features

You need first to connect your email account.

Once it’s connected, you can configure your warm up settings (New Email Account, Reputation Protect or Remove from spam).

Once done, Reply.io will start sending emails (GPT-3 generated texts, but you can use your own templates) to their network of real inboxes.

Your warm up emails get positive interactions and it raises your email reputation.

You have a dashboard to follow how your reputation is going.

Pros

✅ Fully automated

✅ They use a network of real human mailboxes

✅ By default, they use relatively meaningful emails (GPT-3) which is better than gibberish content

✅ 3 warm up profiles

✅ Clean UI

Cons

❌ The ability to warm our own templates and signature is not relevant and risky

❌ The by default warm up templates quality can be improved to build more trust with Google and Microsoft

Pricing

$29 per email account / month

#3. Folderly : Cool UI, nice features but expensive.

Folderly belongs to email deliverability tools since 2019 and is introduced as an “AI-based platform” developed to increase your email deliverability.

How it works - Features

To warm up your email with Folderly, you will need to connect your domain and email address.

The tool will then ask you to create a warm-up email template and run a spam test to check your mailbox and identify potential deliverability issues.

Once this check is done, the warm-up campaign begin and your inbox will interact with other mailboxes of Folderly’s network of customers.

Pros

✅ By default, they use relatively meaningful emails (GPT-3) which is better than gibberish content

✅ Clean UI

✅ They use a network of real human mailboxes

✅ 3 warm up profiles

Cons

❌ Setup is not easy

❌ The ability to warm our own templates is not relevant and risky

❌ Their deliverability test’s process is not reliable (sent by Folderly, not by the user)

❌ Expensive

Pricing

Starts at $49 / month.

#4. Lemwarm : Good solution

Lemwarm is part of Lemlist and is a pioneer in the email warm up space among email deliverability tools. It’s a simple but effective solution to warm up your inbox and improve your deliverability. This is the solution we have been using before creating MailReach.

How it works - Features

As always, you first need to connect your inbox to Lemwarm.

Once your inbox connected, the warm up will start and emails will be sent from your email address towards other Lemwarm’s customers.

Your emails will receive positive interactions such as openings, replies, being marked as important, removed from spam.

This engagement raises your reputation and in turn, your deliverability.

Pros

✅ By default, they now use more meaningful email content

✅ Easy to use

✅ They use a network of real human mailboxes

Cons

❌ The ability to warm our own templates is not relevant and risky

❌ No real email deliverability test

Pricing

$29 per inbox / month.

Final word

There are many email deliverability tools out there and more are coming as landing in inbox gets more complex year after year.

Do your own tests, compare different tools and see how it works for you.

Of course, we’d like to promote MailReach more than other email deliverability tools ones because we’re 100% focused on helping businesses reach the inbox and stay there in the long run.

MailReach is improved and fine-tuned every week to increase its efficiency on inbox placement. That’s why it’s more advanced than other solutions.

As said before, keep in mind the following :

Good deliverability = good sending reputation + not spammy content + not spammy sending setup.

In other words, using an email warm up service helps you raise and protect your reputation.

And using a reliable email deliverability test helps you make sure your content and sending setup are not spammy.

Make sure to use both. And yes, MailReach does both 😉