Frequently Asked Questions

Welcome to the MailTester Ninja FAQ page! Here you will find answers to common questions about our services, subscription management, payment methods, email verification, API usage, and more. Click on the questions to reveal the detailed answers and get the information you need quickly and efficiently.

Unlimited Version

How can I use my key?

To enable you unlimited access, just copy your key anywhere in the main form including curly brackets { and }.

How many emails can I verify with the free version?

The free version allows you to verify up to 8 emails at a time per request, or verify 8 possible emails of your correspondent during an email search. The number of requests per minute allowed depends on our server's usage peak. During high load, we may limit to one request per minute or more.

How many emails can I verify with the unlimited version?

You can verify 100,000 emails per day, and a little more. There is no limit on the total number of emails you can verify over time with our email verifier service.

I subscribed to the unlimited version but can't verify more than 8 emails?

You must have an active subscription and enter your key in the main MailTester Ninja form. You need to enter your key for each new browser or if you clear your cache.

How to verify more than 100,000 emails per day?

To test more than 100k emails per day, you can purchase new keys. Only one subscription is allowed per Stripe account.

How to create a login?

We do not store any personal information about our visitors and clients. We provide an activation key that can be used on any browser and shared. The key authorizes 100,000 email checks per day. The menu offers you to log in to our partner Stripe's portal to manage your payments and subscription.

Subscription Management

How to cancel a subscription?

You can directly use the Login menu to manage your subscription with our partner Stripe. For old clients on PayPal, you can directly cancel your subscription from the second form at the bottom of our Contact page.

How to pause a subscription?

You cannot pause a subscription; you can simply cancel your subscription and resume a new one whenever you want.

How to renew a subscription?

To renew a subscription you have canceled, simply subscribe again from our Subscribe page.

How to subscribe to multiple subscriptions?

To subscribe to multiple plans for your team, simply enter their email addresses during payment with our partner Stripe.

Why is my key deactivated?

If your subscription is canceled and you have exceeded the usage cycle, if your payment failed, or if your trial period ended and no payment was made, then your subscription is immediately canceled.

Payment Management

What payment methods are supported?

Our partner Stripe supports most credit cards, Apple Pay, Google Pay, Alipay, Link, WeChat, and Revolut Pay.

Do you accept cryptocurrency payments?

No, we do not accept any cryptocurrency payments.

I can't make a payment, why?

Please check with your bank or with Stripe the compatibility of your payment method.

Email Verification

Does MailTester send an email to verify an address?

MailTester does not send any email to check the validity of an address. We use queries sent to SMTP servers to test the validity of an email address. These commands were defined in 1982 by the Internet Engineering Task Force under RFC 821. You can find them here.

How to filter checked emails based on the result?

You can export the results from a CSV export or copy them directly into a spreadsheet for further analysis. Our email verification service makes it easy to organize and utilize these results.

How to export verification results?

Please use the copy button or the save button to export your results. You can directly copy the results into any spreadsheet; they will be automatically formatted into columns for easy analysis.

Why do some verified emails appear as Catch-All?

Some mail servers accept all incoming emails regardless of whether the recipient exists or not. They represent 25% of email addresses; you can find more details on our homepage.

Why am I getting different results compared to other solutions?

MailTester Ninja is probably the most reputable and technologically advanced email verification solution. Many expensive alternative solutions do not validate email addresses as thoroughly and will provide different results. Feel free to contact us to compare the obtained results. You will be reassured quickly.

What are the other email verification solutions available?

Please follow this link for more information on the available solutions on the web.

Email Search

Why do I get multiple valid emails for the email search?

We use possible combinations based on your correspondent's full name, which can yield multiple valid results for the same person. Finding an email address also requires knowing your correspondent and having a genuine reason to contact them.

Can I use the email search to build my mailing lists?

No, international legislation does not allow the use of email search to build mailing lists. However, if you are looking to contact an employer or a professional for a specific reason or opportunity, it is allowed.

What are the other email search solutions available?

Please follow this link for more information on the available solutions on the web.

API Usage

How to use the API?

Our API is a standardized REST API and can be called from any code.

What are the API usage limits in the free version?

You can verify one email per minute with the free version.

What are the API usage limits in the paid version?

You can check 100,000 emails per minute from one IP address using your unlimited key with our API. You cannot exceed 3 emails verified every 2 seconds for obvious load reasons. Querying our API in an infinite loop with simultaneous requests will temporarily ban you.

Is there an API to find email addresses?

No, we do not provide solutions to find email addresses in bulk. Legislation does not allow the use of email lists formed without the recipients' consent.

About Our Company

Since when has MailTester Ninja existed?

We have over 10 years of experience in email verification and probably the best reputation.

Who develops MailTester Ninja?

MailTester Ninja is a solution developed by Unlimited & Limited, a London-based company consisting of an international team of passionate people dedicated to providing the best possible tools using the best possible technologies.