9 Best Email Verification Tools in 2025 (Tested & Reviewed)

You can’t grow a business with cold emailing if your email bounce rate is exceeding the critical 5% threshold.

Why? Because it would ruin your sender reputation. You would get permanently blocked by spam filters and your emails would never reach their target audience.

Sure, you may have learnt how to check if an email is valid before reaching out to make sure it doesn’t bounce, but this likely won’t help you if you have a list of 1,000 emails to reach out to.

Well, fret not. We tested a myriad of email verification tools to see which ones can help you solve this problem once and for all.

In this post, you’ll get a full review and comparison of 9 tools that stood out to us so you can choose the best one for your needs.

The Best Email Verification Tools

Are you wondering what makes these tools special? We tested each one of them on 800 emails we knew were correct and 200 that we knew would bounce. Here are the 9 that managed to impress us.

1. lemlist’s Email Finder and Verifier

Rating:

⭐⭐⭐⭐⭐

• G2: 4.5 (264 reviews)
• Capterra: 4.6 (387 reviews)

lemlist is a sales engagement platform that will help you find, engage, and convert your ideal buyers across multiple channels.

Overview:

With lemlist, you can find all your leads’ contact info (automatically validated) without the need for third-party tools and with minimized spam risks.

Thanks to a method called ”waterfall enrichment”, the Email Finder and Verifier combines the best third-party sources to give you 80% more valid emails than other verification tools.

This is the equivalent of asking six different providers for up-to-date information without navigating and subscribing to multiple apps.

For each lead, the app will:

• Clean the first name and last name
• Extract and save relevant available information from the lead’s LinkedIn profile
• Retain the best email we found from multiple providers
• If available, save additional information such as phone number, civility, job title, and other relevant details

Free Plan & Chrome Extension:

With the lemlist Chrome extension, you can scrap up to 100 verified emails for free every month!

This plan is free forever, so you won’t have to commit to any payments to build your email lists.

Although you can enjoy the free plan for as long as you want, you have the option of buying credits separately to find more emails (without payment commitment).

Pricing:

→ Free trial ✅

lemlist offers the Email Finder and Verifier in all plans, and you can push the verified emails directly to your lemlist campaigns. This means no more bouncing back and forth from one tool to another.

✅ Pros:

• 80%+ No spam risks. No third-party tools. No extra expenses.
• All your leads’ emails—valid, verified, and ready to use—in one place.
• Once you find your leads’ emails, you can push them directly to your lemlist campaigns in one click and start your outreach.

❌ Cons:

• Some advanced features might be available only in higher-tier plans.
• Integration with certain third-party tools might require additional setup.

2. Bouncer

Rating:

⭐⭐⭐⭐⭐

• G2: 4.8 (232 reviews)
• Capterra: – 4.9 (233 reviews)

Bouncer was an obvious choice thanks to its budget-friendly pay-as-you-go plans.

Overview:

As we’ve said, if you’re looking to verify emails on a small budget, Bouncer is a good option.

It got through our list quickly with a processing time of 5 minutes and a bounce rate below 1%.

Bouncer also offers a deliverability kit that tests inbox placement, verifies authentication, and monitors blocklists.

Pricing:

→ Free trial ✅

Bouncer offers a pay-as-you go option, where you can start verifying 1,000 email addresses for $8 and go from there. You can also go for a monthly subscription where you verify that amount for only $6.40 per month.

To use the deliverability kit, the plans start from $25 per month. As for real-time verification, the cheapest option is $49 per month with 10,000 monthly checks.

✅ Pros:

• We were happy with the accuracy of the data.
• Bouncer picked up up risky emails and analyzed toxicity.
• The offering goes beyond email verification if you are willing to pay more.

❌ Cons:

• The interface itself was slow.
• You need to download the list of deliverable emails after bulk checking to see your results.

3. ZeroBounce

Rating:

⭐⭐⭐⭐⭐

• G2: 4.7 (515 reviews)
• Capterra: 4.7 (458 reviews)

ZeroBounce is a tool that regularly gets praise for its accuracy, which is why we had to give it a test drive.

Overview:

This tool definitely stood out for its user-friendly interface.

If you’re still new to email verification software, you might want to start with an easy-to-use one like this (novices especially love it).

We were also happy with the number of correct emails it found which was above 700/800.

Pricing:

→ Free trial ✅

With ZeroBounce, you can pay as you go, or you can pay monthly rates based on credit amount.

Choosing a monthly rate is slightly cheaper as you get 2,000 emails for $18. If you were to pay as you go for the same amount, you’d be paying $20.

More comprehensive plans also exist. These offer deliverability tools like blacklist monitoring, DMARC monitoring, email warmup, etc., and start from $49 per month.

✅ Pros:

• We particularly enjoyed the intuitive platform.
• The accuracy rate was high.
• The tool integrates with WordPress and WooCommerce to prevent spam.

❌ Cons:

• The results were downloaded as a .zip file which isn’t entirely convenient.
• The free trial was limited in terms of the number of verifications and access to certain features.

4. Clearout

Rating:

⭐⭐⭐⭐⭐

• G2: 4.7 (307 reviews)
• Capterra: 4.7 (83 reviews)

Clearout also goes beyond email verification as it allows users to find email addresses and validate phone numbers.

Overview:

We found this tool to be one of the best stand-alone email verification tools.

It took 7 minutes to go through our list but found 768 correct email addresses out of the 800 that we had.

The bulk feature works by uploading a CSV (or XLSX) file which is straightforward.

Like ZeroBounce, Clearout integrates with WordPress to prevent spam and has a Google Sheets add-on so you can validate email addresses directly from your spreadsheet.

Pricing:

Clearout offers a pay-as-you-go pricing system as well as subscription plans based on the amount of credits you wish to purchase monthly or annually.

The starter plan costs $21 and offers 3,000 credits per month.

✅ Pros:

• The tool allows bulk uploads of CSV data.
• The Google Sheets add-on is practical.
• We were happy with the accuracy rate.

❌ Cons:

• The validation process was slower than we expected.
• Although the tool offers many integrations, the integration process can be challenging because it isn’t carried out directly with the other systems (it’s done through third-party tools like Zapier).

5. Emailable

Rating:

⭐⭐⭐⭐⭐

• G2: 4.8 (273 reviews)
• Capterra: 4.7 (334 reviews)

Emailable was a promising option with its 99% deliverability guarantee and 24/7 customer support.

Overview:

This proved to be one of our top free bulk email verification tools. The first 250 emails were free, which was more than double what the other options offered.

The processing was also quick. It only took a little while for our file to be processed, and the tool found 746 correct emails out of 800.

The bounce rate was slightly higher than some other options, but again it was below 1%.

Pricing:

→ Free trial ✅

What makes Emailable attractive to users is the fact that it offers 250 free credits.

You can choose to go for a credit system, or a monthly subscription for the monitoring or deliverability plans.

✅ Pros:

• The email list could easily be imported from other platforms to be bulk-checked.
• The pricing options were flexible and budget-friendly.
• The interface was modern and easy to navigate.

❌ Cons:

• The tool failed to work with @yahoo email addresses.
• It was difficult to understand the status of the verified emails sometimes.

6. NeverBounce

Rating:

⭐⭐⭐⭐⭐

• G2: 4.4 (136 reviews)
• Capterra: 4.5 (45 reviews)

NeverBounce is a verification tool praised for its ease of use and great integrations.

Overview:

NeverBounce found 650 correct emails out of 800 which was fewer than what we got from the other platforms. The processing time was only 5 minutes.

We particularly enjoyed the instant bounce analysis feature which determines whether your email list needs cleaning so you can get an idea of whether you need to go through the lengthy verification process or not.

Pricing:

→ Free trial ✅

NeverBounce works with a pay-as-you-go system where you can verify 10,000 email addresses for $50.

It’s worth noting that this tool can be a good choice for nonprofit organizations as they get a 20% discount.

✅ Pros:

• The tool offers automated, near-daily email list cleaning, which is a feature that is not commonly found with other services.
• The instant bounce analysis is a feature that can save time.
• We found the interface user-friendly.

❌ Cons:

• The accuracy was not as high as the other tools.
• NeverBounce only gives 10 free email verification credits, which may not be sufficient for users looking to thoroughly test the service before committing to a paid plan.

7. Hunter

Rating:

⭐⭐⭐⭐⭐

• G2: 4.4  (‎559 reviews)
• Capterra: 4.6 (678 reviews)

Hunter is designed to simplify finding email addresses. Besides email addresses, it helps you find information such as the name, job title, and phone number of your leads.

Overview

This tool was pretty straightforward — you copy and paste the email address you want to validate, and Hunter scrapes its database.

You can also use the bulk finder to verify emails in bulk, but the free plan allows up to 50 verifications.

Hunter integrates with tools such as Gmail, Google Sheets, Salesforce, HubSpot, Pipedrive, Zoho CRM, Zapier.

Pricing:

→ Free trial ✅

Subscription plans start at $49 per month when billed monthly, but annual payments get a 30% discount.

Plans vary based on the number of requests per month (from 500 to 10,000).

✅ Pros:

• The simple design lets you find and verify email addresses quickly.
• You can use it for free with up to 50 email searches per month.
• There’s a free plan for the Chrome extension and Google Sheets add-on.

❌ Cons:

• The mail verifier couldn’t verify webmail addresses (like @gmail or @yahoo).
• The Google Sheets add-on has a limit of 500 actions.

8. Kickbox

Rating:

⭐⭐⭐⭐⭐

• G2: 4.5 (368 reviews)
• Capterra: 4.4 (‎70 reviews)

We were interested in Kickbox thanks to its reputation as a reliable platform and the fact that it offers real-time verification.

Overview:

Kickbox uses both API and drag-and-drop to verify emails. We were happy with the accuracy of our results and the tool used its proprietary Sendex™ Score to measure our email addresses’ quality.

According to our experience, Kickbox is best for:

• Businesses that need ‌high accuracy and security in email verification.
• Users who want to integrate email verification with their existing tools and workflows.

Pricing:

→ Free trial ✅

Kickbox offers up to 100 free verifications with a simple-pay-as-you-go pricing system, as shown in the image below.

✅ Pros:

• The verification was quick and accurate.
• The platform offers robust data security and compliance with various regulations.
• The scoring system and analytics were helpful.

❌ Cons:

• Some users report poor customer support and slower response times.
• While Kickbox excels in email verification, its spam detection and risky address identification could be improved.

9. MillionVerifier

Rating:

⭐⭐⭐⭐⭐

• G2: 4.3  (26 reviews)
• Capterra: 4.5 (100 reviews)

MillionVerifier, formerly known as HuBoCo, is a versatile tool that also automates email verification.

Overview:

We found the process quite simple. You can upload files or copy-paste your email addresses directly into the dashboard.

You can also integrate MillionVerifier with your website or app using the email verification API. Users submit email addresses on your platform, and MillionVerifier validates them, reducing bounce rates and enhancing deliverability.

Pricing:

→ Free trial ✅

MillionVerifier offers never-expiring credits that you only buy once and use whenever you decide.

On the website, you can simply type in the amount of emails you wish to verify and the price will be calculated immediately.

✅ Pros:

• The tool offers budget-friendly plans.
• It integrates with email marketing platforms to automate list cleaning which makes it popular among email marketers.
• Its API enables real-time verification.

❌ Cons:

• It struggled with catch-all and @yahoo email addresses.
• Customer support isn’t available around the clock. Some users have reported slower response times and occasional issues with support quality.

Our Ranking of the Tools

Now that you have a full review of each tool, let’s see how they stack up against each other.

The Most Accurate

lemlist’s Email Finder and Verifier proved to be the most accurate one thanks to its waterfall enrichment method. As we’ve said before, lemlist uses more than one provider to check data, which means you get 80% more valid emails than with other verification tools.

The Fastest

As you can imagine, a large enough email list can make your verification painfully slow. Emailable processes 10,000 emails in 2-3 minutes, which makes it the fastest tool we have tested so far.

The Most Affordable

Bouncer is the most affordable option for those with a tight budget. It offers a pay-as-you-go plan where you can verify 1,000 emails with just $6.40.

The Highest Number of Integrations

Emailable offers integration with over 90 platforms. You can connect and clean your email lists in a variety of email service providers (ESP), customer relationship managers (CRM), and marketing platforms.

The Most Secure

This one definitely goes to Kickbox which has a robust data security policy and is both GDPR and CCPA compliant.

How We Tested

As previously stated, each tool had a list of 1000 emails to go through (of which 800 were correct and 200 invalid).

Here is what we looked for:

An accuracy rate above 95%: An email verifier with low accuracy will miss invalid addresses or remove valid ones from your list.

Speed: All the tools that made it to this list can process thousands or more verifications in an hour.

Pricing and free trial: We focused on flexible pricing models that should align with your budget without compromising quality.

Integration with other platforms: At this day and age, manually transferring data is simply not acceptable. All the tools on this list integrate with other tools—just make sure that they have the email marketing and CRM platforms you need.

Customer support: Even the best tools encounter bugs and glitches. We made sure to pick out only the services that offer their users support.

Security: Your email list likely contains valuable customer information. The best tools will have clear privacy policies highlighting how they handle and protect your email list data.

Reviews and ratings above 4.5/5: Our selection was based on factors beyond our own experience.

Do You Really Need Email Verification Tools?

Yes! A high bounce rate is no joke when it comes to cold outreach. Verification tools check your email addresses in bulk so you can avoid sending emails to addresses that will bounce them back.

The fewer the emails that bounce, the better your deliverability, and your chances of avoiding the spam folder.

That being said, you don’t necessarily need a separate tool for verifications since this can mean an added expense to your toolkit.

You can get verification, warmup, deliverability, leads AND outreach campaigns in one and the same platform. Just get your free trial today and give lemlist a go.

But What’s Best for You?

Do some soul-searching. Are you prioritizing accuracy? Maybe you need to get the most budget-friendly option. What you choose will essentially depend on what you need.

As we’ve outlined before, if speed is a must, Emailable will be a good option. For data security, you can go for Kickbox. If you need to find email addresses as well as verify them, then lemlist won’t disappoint.

Check out the integrations each tool offers. Make sure they align with your already-existing stack.

And finally, don’t forget to test out the tool you choose with a free trial. It’s the only way you get to see the interface for yourself.

Burçe Ermetal

Organic Search Specialist @lemlist. Building a hub to help sales teams get more sales.