ZeroBounce vs. MailTester.com
MailTester.com is a relatively popular name in the email verification space. But does it offer superior pricing and features compared to ZeroBounce’s email cleaner?
Using a reliable email validationⓘA process that determines if an email address uses valid syntax, exists on a given domain, and is configured to receive incoming email messages service is just as important as the cost when it comes to improving email deliverability. That’s why we did the company research for you so that you can choose the best email list cleaning service for your email lists.
Get 100 free monthly email verifications when you sign up with a business/premium domain.
Compare MailTester.com and ZeroBounce
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Comparison as of March 2025
Disclaimer: The third party's name is utilized for comparison purposes only and is the trademark of its respective owner. ZeroBounce claims no rights whatsoever in the use of such name and/or any related trademarks. ZeroBounce is not affiliated with the third party referenced on this page.
The No. 1 email validationⓘA process that determines if an email address uses valid syntax, exists on a given domain, and is configured to receive incoming email messages service for 400,000+ clients
Read the ZeroBounce vs. MailTester.com G2 comparison report
How accurate is MailTester.com?
MailTester.com’s front page advertises its ability to clean emails with 99% accuracy. This high level of accuracy makes it potentially one of the stronger email verifiers available on the market.
However, it’s crucial to note that MailTester.com does not guarantee these claims.
ZeroBounce also offers 99% email validation and verification when you clean your email lists. The difference is they offer a no-questions-asked, money-back guarantee to all customers.
They guarantee you’ll get an accurate, clean list, improve your email deliverability and get your email bounce rateⓘThe percentage of emails that are undelivered vs. delivered to the intended recipient. to a safe range below 2%
ZeroBounce allows you to clean your entire list without risking poor results. If they don’t live up to the promise, you can take your budget and find an email cleaner that can do better with ease.
What types of emails can MailTester.com detect?
Since our last comparison, MailTester.com has improved the number of email types it can detect when you use its email verifier.
Their email list cleaning reports currently break your emails down into the following categories
Types of Emails MailTester Identifies
Deliverable
Invalid
Disposable
Accept all
Spam
traps
Unknown
Their site also makes mention of an ability to detect “known complainers,” but it does not list how it does this or how it appears in your report in their documentation.
MailTester.com’s email verifier offers other benefits, such as removing duplicate emails, anti-greylisting to bypass spam prevention, and domain issue detection.
ZeroBounce offers superior, comprehensive email detection
ZeroBounce can generate more than 30 status types for the email addresses on your list. Most other email verifiers struggle to get close to its precision and accuracy.
Types of Emails ZeroBounce Identifies
Deliverable
Invalid
Alternate
emails
Alias
Role
based
Toxic
domains
Possible
traps
Global
suppression
In your list cleaning report, you’ll see the validation status (valid, invalid, or unknown) and a descriptive sub-status that gives you more significant insights into your email list. You can easily browse the complete in their user-friendly documentation.
ZeroBounce will also highlight any outstanding issues during email validation, including problems with email domains, SMTP configuration, or mx exchange. They also use anti-greylisting technology to bypass common spam prevention tactics, leaving you with more data and fewer unknown results.
They’ll also remove duplicate emails from your list and automatically correct typos or syntax errors. You’ll never spend a credit unless they can get you a result.
Last, but not least, ZeroBounce is the only email validation service that has a solution for identifying Yahoo and AOL-disabled emails.
And, it’s free. When you upload your email list for validation, ZeroBounce scans the list for Yahoo and AOL email addresses. If it contains a notable volume of these accounts, you’ll get the option to opt into Verify+ from ZeroBounce. This additional service sees ZeroBounce sending a message to those accounts to check for bounces.
There’s no risk to your company or reputation, and ZeroBounce handles the verification for you.
MailTester.com can’t score your catch-all emailsⓘAn email set up by a business to capture email messages sent to their name via an invalid address (e.g., j0hn@company.com instead of john@company.com). Catch-all inboxes receive a high volume of spam and may not be actively monitored by the owner.
There’s a chance a catch-all (accept-all) result will pop up on your email list eventually. Most email verifiers, like MailTester.com, will detect them, but that’s it. What do you do with a catch-all - is it valid or undeliverable?
Catch-alls can be somewhere in between. Some companies use them to ensure incoming emails get delivered even if the recipient address is invalid. But, they often become spam havens, go dormant, and offer low engagement.
ZeroBounce provides Email ScoringⓘA ZeroBounce service that uses AI and proprietary technology to grade an email contact based on their likelihood to interact with an email and convert (most commonly used for catch-all email addresses). that lets you know the engagement level of any catch-all email on your list. That address might become a valuable email campaign lead if it scores high. If it scores low, it’s safe to kick that bad data to the curb.
MailTester.com can’t provide any similar service to give you the deep insights you need to improve your email marketing results.
MailTester.com can’t provide additional email data
Outside of detecting certain email statuses and technical issues, you get what you pay for with MailTester.com.
On the other hand, ZeroBounce delivers a wide range of appended data to your email list cleaning report when available. You’ll not only know the status of the email, but also the domain, IP, mx information, and other technical details.
You can also learn social data crucial for segmenting and retargeting your emails. ZeroBounce aims to find the email owner’s name, gender, and location to help you learn more about your subscribers.
Finally, ZeroBounce provides Activity Data in your email verification report. This AI-driven service lets you know whether or not your valid contacts are active based on their past opens, clicks, forwards, and unsubscribes. You can track activity from one month to one full year.
MailTester.com can provide some clean emails. ZeroBounce aims to overhaul your email deliverability and improve your email marketing results.
ZeroBounce is the only mobile email verifier
Recently launched, ZeroBounce is now the only reputable email verification service with a fully-responsive mobile experience.
You can not only clean emails from your desktop device, but you can now upload your email list with your iPhone on the go. Clean emails, score them, track Activity Data, manage your API, set up integrations, and more.
MailTester.com can’t provide the convenience and accessibility of ZeroBounce’s mobile experience.
At ZeroBounce, customer service is everything
As easy as email verification can be, it’s good to know someone’s on your side if you have a technical issue.
MailTester.com provides support by phone 9 AM - 6 PM EST - weekdays only. These limited hours only cater to a specific audience of clients worldwide.
ZeroBounce provides truly global email validation. No matter where you are, you can access customer support by phone or live chat within seconds. Their support is available 24/7 - weekdays, weekends, and holidays.
You can access their complete and comprehensive help documentation from their website anytime.
Create a free account today
Accurate, fast, and secure email validation
Sign up for 100 free monthly email verifications
ZeroBounce offers more than email validation
MailTester.com cleans emails and provides a simple deliverability toolkit, including inbox placement and blacklist detection.
ZeroBounce cleans emails, scores them, fills in technical and social data points, and provides recent Activity Data for your campaigns. They also offer a robust email deliverability toolkitⓘZeroBounce’s package of email deliverability tools and services, which includes the following: Warmup, DMARC Monitor, Email Finder, Blacklist Monitor, inbox placement testing, and email server testing. that helps you avoid bounces, land in the inbox, and convert more customers.
Whether you need to improve your emails at your desk or on the go, ZeroBounce always has the solution.
No one knows security better than ZeroBounce
Customer data security is ZeroBounce’s top priority. Our developers strive not only to deliver the world’s most accurate and accessible email verification experience but also to ensure that your personal, email, and financial data is secure.
MailTester.com makes no mention of any security features on its platform.
ZeroBounce is SOC 2 Type 2 and ISO 27001 certified. They also comply with GDPR, PCI, and CCPA to ensure your data is secure. They also work closely with cybersecurity experts to help with penetration testing and risk management assessment.
SOC 2
Type II
Compliant
ISO 27001 Certified
HIPAA Compliant
GDPR Compliant
Data Privacy Framework (DPF)
CCPA Compliant
Frequently asked questions
ZeroBounce offers more accurate, comprehensive email verification by identifying more than 30 email types. It also provides a complete email deliverability toolkit, including inbox placement and email server testing, blacklist monitoring, and email finding services. It also offers 24/7 customer support, 365 days a year.
MailTester.com categorizes your email verification results as the following:
• Deliverable
• Invalid
• Disposable
• Accept-all
• Spam traps
• Unknown
MailTester.com does not mention or advertise a money-back guarantee. By comparison, ZeroBounce guarantees 99% email verification accuracy.
An email verifier identifies your database's valid, invalid, and high-risk emails. You’ll improve your email bounce rate and overall email marketing engagement by eliminating the latter.
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