Email Checker & Email Verification Tool

E-mail checker: what this is and what are its peculiarities and principle of work

E-mail marketing (or otherwise called direct marketing) in 2020 still remains one of the main channels of making sales. A huge number of people buy using websites of sellers, platforms, messengers, and social media but without e-mails, the sales cycle would be far from completeness. That’s why many people working in the sales industry need such a tool as an e-mail checker. What is it? How does it work? What specifically brings you? We are giving all the answers to these questions in this article.

What is the e-mail checker

There are plenty of tools, which are designed to verify e-mail boxes. They all offer their users a paid or free opportunity to find out information about e-boxes. The specific information that users find out about this or that e-mail differs from a tool to tool, as well as the methods that every e-mail tester uses. Basically, in order to know if some e-mail real or fake, viable or non-living, belongs to blacklists or not, one has to open the page of an e-mail checker and paste there the name of the e-mail. In a short while, the information about does this e-mail exist is collected and given to a user. Some e-mail checkers allow only one-by-one check, while others offer checks of hundreds and thousands of e-mails in one go. As a rule, the batch check is a paid option. Here in, on top of the main page, which is done in a landing style, everyone can check individual addresses – this only takes seconds. If you work professionally and need to check hundreds, thousands, or millions of e-mails in a short period of time, it is necessary to buy a subscription.


Users are offered in three types of subscriptions:

  • ‘Pro’ for 10 dollars a month, which allows checking 1,000 e-mails 

  • ‘Agency’ for 30 dollars a month, which allows checking 5,000 e-mails

  • ‘Enterprise’ for 100 dollars a month, which allows checking 20,000 addresses. 

There is a limit in checks here: per hour and per month and it depends on a package. For instance, in the Enterprise pack, it is possible to check 5,000 e-mails within an hour or 20,000 within a month. To have an opportunity to check a bigger amount, you have to pay USD 0.003 for any extra e-mail address. Thus, if you have, for instance, 100,000 e-mails to check, it’ll cost you 100+240 dollars = 340 in total. A million addresses will cost ya 2,940+100 = $3,040. As you can see, to check if e-mail is valid is not a cheap pleasure and is suitable only for those companies who are seriously aimed at working with large massifs of data.


The principle of work of an e-mail checker

To make e-mail address verification, the series of automatic actions are performed in


  1. If the address is existing and does not belong to a known set of one-time or fake addresses

  2. Establishing the SMTP connection and checking if the address is a ‘catch-all’ type of thing (if it is a catch-all one, then the usefulness of sending letters to it might be low)

  3. If there are registrations of a particular e-mail on any Wordpress-based website, on, on LinkedIn, and some other reputable resources. If there is the registration of it on any or several of these – it increases the level of trust to such an e-box.

The results are given out in the form of existing/non-existing, the trust rate (in %, the more the better – and if it is over 60%, then this e-mail checker considers the e-box a good one), if it is an SMTP catch-all (Y/N), and if there is any SMTP connection. 4 indices are given out to a user eventually. 


Who might find an e-mail verification useful tool?

The range of potentially interested users who might want to know how to check if an e-mail is valid is broad: from natural persons who wish to check the existence of an e-mail that they have received from a friend, colleague, or acquaint, to the businesses, who sell online through the direct marketing (and send newsletters to the ones who subscribed).

So, the list may look like this:

  • E-mail marketers and brokers

  • Call centers

  • Lead generation companies

  • Profit and non-profit organizations

  • IT professionals

  • Natural persons.


Is there any API that developers could use?

Yes, there is an API developed for Curl, Go, JavaScript, and Python. The needed documentation to check e-mail online is attached here: According to this e-mail verification tool, hundreds of companies have already made integration through the API.


What are the benefits of an e-mail checker?

The reasons you might lookup the existence of an e-box are pretty obvious:

  1. You wanna be sure that a letter or letters you are going to write and send will not get into the void (and they are read by humans, not bots – e-mail address owners)

  2. To improve the bounce rate of your e-mail campaign (according to various sources of data, it is believed that about 80% of reasons for unsuccessful direct marketing campaigns is because of the irrelevance of the e-mail database)

  3. To update/refresh the existing database before sending it if the price of refreshing is lower than the price of sending letters to irrelevant e-boxes.

As you can see, a Gmail checker is about saving your time, optimizing expenses, and improving the success rate of up to 90% of delivery throughout the campaign.


Frequently asked questions

How do you obtain data for the verification?

The biggest part of online services that provide the functionality of online mail does have a special way of interacting with our e-mail address checker, as they can be pinged. It means they take a special string of a request and send back a special string of a response. Not all of them but the most part. And so as they respond to our requests, we know they exist. Further on, we connect to the mail server and, by the sequence of technical commands, we find out some data about some e-mail, which we then use to understand if this mail exists, valid, a one-time mail or not, is owned by a bot or person, is it added to white or blacklists (e-mail spam test), and other things. Eventually, this forms the % of trust to this e-box, which we show in the check e-mail results. Also, we connect to other resources to collect data about this e-mail from them.


Do you record the e-mails you’re checking?

No. We highly respect your confidentiality during the e-mail validation and we store information about the check no longer than it should be stored to perform checks (usually, seconds or minutes, after which it is erased completely). 


Do you use social media for confirmation?

Yes. Some of them are Google, LinkedIn, and Gravatar – all those with open access.


How this service differs from competitors? 

Although, technically, they are very closely similar, actually, the fact of connecting to a host of external resources to collect additional data makes the real difference. Not always, a mail server can tell the needed info – but additional sources of data can.


Is there any trial?

Yes. For free users – natural persons, there are 10 checks from 1 IP are allowed per month in this free e-mail verifier. For corporate users, which attached the payment data, there are 100 free checks upon the registration or 10 if they do not attach payment data.


Is there a bulk check available in the e-mail verifying software? 

Yes. Corporate clients may upload a TXT or CSV file with up to 100,000 lines of e-mail addresses to perform a check if e-mail is real.

Included free with every account.

  • Instant Bounce Analysis

    Test your data. We’ll report back whether it’s OK to send or needs to be cleaned. Any size.

  • Testing for New Users

    Get 1,000 free verifications when you sign up. Test single emails, a bulk list, or our API.

  • Awesome Support & Security

    We pride ourselves on consistent service and availability; we’re here to help.

Common Questions About Email Verification

You may still have some questions about the email verification process. The following are some of the more common FAQs. The answers here will help you better understand the full value of our tool. If you still have questions after reviewing this section, feel free to visit our Help Desk or contact our Customer Success Team; we’re always happy to hear from you.

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Other Useful Steps to Improve Email Deliverability

Making sure your emails are properly delivered is important. Thus, senders should also consider taking these steps before sending emails to followers:

By taking these steps and using NeverBounce, you’ll be much more likely to consistently deliver emails. Luckily, our single email checker is both thorough and efficient. All you have to do is integrate it with your platform to ensure anyone who signs up for your newsletter is actually providing a valid address. This is important in the competitive field of email marketing.

Don’t let a poor sender reputation prevent you from reaching your followers. Create your NeverBounce account and start using our email and bounce checker today!

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