Verifying an email address

To verify an email address you have found in the Domain Search, click the verification icon next to it in the Domain Search:

You can also verify any professional email address using the Email Verifier tool:


What checks are performed with the Email Verifier?

Hunter runs several checks to make sure the best verification score is provided:

  • Format: we verify the format of the email address is correct and looks something like "email@provider.com". We also ensure the address doesn't look like a random email address. For example, 1e49cs1pb6@company.com won't pass the test.
  • Type: We check if the email address has a domain name used for temporary email addresses and we also verify if the email address uses a webmail like Gmail or Yahoo.
  • Server Status: We check if there are MX records on the domain. If there aren't, the email address can't receive emails. We also perform an SMTP check to see if we are able to connect to the SMTP server (indicated in MX records).
  • Email Status: We test the email address and see if it bounces or not and we check if the server has a catch-all policy that accepts all the email addresses. There are 4 possible statuses, which are detailed below.

How can I be sure an email is deliverable?

Running the emails that are gathered in Hunter or from other sources through the Email Verifier functionality will give you an accurate indication of the deliverability status of the email.

The Email Verifier can provide you 4 different results:

Valid email: it means every information we got regarding the email was fine as it passed all our verification checks.

A deliverable email can also provide sources where it can be found on the web.

Accept all email: Hunter can't be certain about the deliverability of the email as the domain associated with it won't allow us to perform a full verification due to its accept all policy.

Accept all domains are set up to accept all emails which prevent us from knowing if a mailbox has indeed been set up and if emails sent to this address will bounce or not.

For example, the domain “hubspot.com” is one of these types of domains. So, if we check anything@hubspot.com we will always receive an “OK” response for any mailbox. This is why we cannot be sure the emails associated with them are valid.

Invalid email: the email did not pass one or more checks in the email verifier and it is not deliverable.

In the example below, both the server and email status failed for the email, meaning the email will certainly bounce as it does not exist.

Blocked email: the email server has blocked our verification process, so we cannot be sure if the email is valid or not.

When an email is blocked, it does not cost any verification requests.

The Confidence Score

All the emails found in Hunter have a confidence score assigned which will provide you with a first overview of the likeliness that the email is valid. Simply hover your mouse over the dot next to the emails found in the domain search to reveal the confidence score.

Email addresses with a confidence score of 90-95% or higher have a high chance of being fully deliverable although a high score does not guarantee deliverability.

Providing an accurate and updated confidence score is our first priority: confidence scores are constantly updated based on the quality and quantity of public data points associated with the email.


To have a complete deliverability report we highly suggest running the emails that are gathered through the Email Verifier tool. 

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