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 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.
* With an active ZeroBounce ONE™ subscription. Otherwise, terms and conditions apply.
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
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 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.
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.
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.
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.
| MailTester | |
|---|---|---|
| Credit Expiration | no expiration* | no expiration for PAYG credits only |
| Email Bounce Detection |  | |
| Accuracy Rate | 99.6% | 99% |
| Money-Back Guarantee | | undisclosed |
| Free Deduplication | | |
| Spam Trap Detection | | |
| Disabled Email Detection: Identify Yahoo and AOL-disabled email accounts. | |  |
| Email Abuse Detection | | |
| Toxic Domain Detection | | |
| Disposable Domain Detection | | |
| Catch-All Domain Detection | | |
| Activity Data - Identify Openers, Clickers, Forwarders and Unsubscribers on your list | | |
| Email Data Append | | undisclosed |
| Social Append | | undisclosed |
| IP Information Append | | undisclosed |
| Email Gender Append | | undisclosed |
| Data security: Unique key for each file uploaded in the system; military grade encryption algorithm to safeguard all files and personal information. | | undisclosed |
| Email Finder | | |
| iOS App | | |
| 24/7 Support | | |
| Credit Expiration |
ZeroBounce no expiration* |
MailTester no expiration for PAYG credits only |
| Email Bounce Detection |
ZeroBounce |
MailTester |
| Accuracy Rate |
ZeroBounce 99.6% |
MailTester 99% |
| Money-Back Guarantee |
ZeroBounce |
MailTester undisclosed |
| Free Deduplication |
ZeroBounce |
MailTester |
| Spam Trap Detection |
ZeroBounce |
MailTester |
| Disabled Email Detection: Identify Yahoo and AOL-disabled email accounts. |
ZeroBounce |
MailTester |
| Email Abuse Detection |
ZeroBounce |
MailTester |
| Toxic Domain Detection |
ZeroBounce |
MailTester |
| Disposable Domain Detection |
ZeroBounce |
MailTester |
| Catch-All Domain Detection |
ZeroBounce |
MailTester |
| Activity Data - Identify Openers, Clickers, Forwarders and Unsubscribers on your list |
ZeroBounce |
MailTester |
| Email Data Append |
ZeroBounce |
MailTester undisclosed |
| Social Append |
ZeroBounce |
MailTester undisclosed |
| IP Information Append |
ZeroBounce |
MailTester undisclosed |
| Email Gender Append |
ZeroBounce |
MailTester undisclosed |
| Data security: Unique key for each file uploaded in the system; military grade encryption algorithm to safeguard all files and personal information. |
ZeroBounce |
MailTester undisclosed |
| Email Finder |
ZeroBounce |
MailTester |
| iOS App |
ZeroBounce |
MailTester |
| 24/7 Support |
ZeroBounce |
MailTester |
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.
MailTester.com’s front page advertises its ability to clean emails with 99.6% 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 99.6% 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 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.
Valid
emails
Invalid
emails
Alternate
emails
Alias
Role
based
Toxic
domains
Possible
traps
Global
suppression
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 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.
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.
Accurate, fast, and secure email validation
Sign up for 100 free monthly email verifications
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. ZeroBounce ONE™ 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.
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.
ZeroBounce offers more accurate, comprehensive email verification by identifying more than 30 email types. ZeroBounce ONE™ provides complete deliverability tools, including inbox placement and email server testing, blacklist monitoring, and email finding services. It also offers 24/7 customer support, 365 days a year.
Get 100 free monthly email verifications when you sign up with a business/premium domain.
SOC 2
Type II
Compliant
ISO 27001 Certified
HIPAA Compliant
GDPR Compliant
DPF Compliant
CCPA Compliant
