A powerful and flexible API for
automated email screening

Filter and prevent unwanted emails from getting into your list with’s easy-to-integrate, highly customizable API. Customize the API, add it to your lead pages and opt-in forms and prompt your users if they mistakenly submitted an invalid email. API is available in four languages.

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Flexible API for automated email screening

How it works

Copy Paste

Copy and then paste the code to your website and let be your watchdog. API would catch every single invalid email submissions even without your supervision. API Copy Paste Fuction

Developer API

Mailtester API is built by coders, for businesses and coders. We offer complete libraries for four languages: Php, Python, Ruby and C#. Just tweak the code and Mailtester API would screen according to rules you set. Developer API

Libraries API comes in 4 different libraries

$email = "[email protected]";
$url = "".$key."&email=".$email;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true );
$response = curl_exec($ch);
echo $response;
from emailvalidation import MailtesterSingle E = MailtesterSingle('PUT_YOUR_KEY', '[email protected]') result = E.control() print result // answer is string 'ok' or 'fail'
- To Upload a Bulk File
client.upload_file("","") path/to/file is optional if file_name file is present in same directory
- To get the status of the last uploaded file
- To get the status of any file with file_id
- Create a client
client ="") Verify Single Email
client.one_by_one("[email protected]")
please visit
"Email":"[email protected]"
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Keep your lists clean for free

One toxic email stopped at the point of entry is one credit saved. By preventing emails with syntax errors, invalid emails and fake entries you keep your list clean at no cost.

More business

If your customer mistakenly submits a wrong email, all hopes of getting back to him/her is lost. Mailtester API prompts users to resubmit correct emails if they mistakenly submit an incorrect email and saves you from losing leads.

Flexible and automated

You can easily set up your own rules of email screening by making small changes to the API code. Once added, Mailtester would do its job. No further supervision required.

Customer testimonials

Heath Atwood

Email Marketing Expert

When I signed up for, I was a bit skeptical at first. How much difference can it make for a relatively smaller company like us? Answer: a lot. We didn’t change our email strategy much still our email open rate has increased like 3-4%. I recommend

Caitlynn Potts

Chief Marketing Officer

We were looking for a mail validation service that can handle a large volume of emails and return accurate results. Now is our go-to solution.

Joshua Mcnair


We are a small startup and can’t afford to spend hundreds of dollars every month on email verification.’s flexible pricing plan works for us. And the service you would get is excellent.

Alex Lee

Sales And Customer Success Manager
AB Real Estate

Efficient, reliable and pocket friendly--- I love I have personally recommended this app to my entreprenuer friends.

Jordy Eubanks

Horizontel is awesome. We have big lists here with us and we keep them clean with It never disappoints.

Anaiah Whitten

Marketing Expert

I am a fan. is super accurate and easy to use. I set it up and forget about it. It’s doing its job without any issue.

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