We designed the Email Verifier to be as complete as possible, with validations
made at multiple levels: format, domain information, the response of the mail
servers and comparison with our unique base of 100+ million professional email
Hunter is used by
and chosen by leading companies.
Common questions about the Email Verifier
What is the purpose of an email verifier?
An email verifier, or email checker, is a tool to validate that an
email address exists and can receive emails.
Verifying is important before contacting new recipients to
bounces and protect your sender's reputation.
Hunter's Email Verifier does a complete check of email addresses,
verifies if it appears publicly on the web and returns the sources.
This is the list of validations the Email Verifier performs:
Valid format: First, we validate the format of the email address is
correct and looks something like "firstname.lastname@example.org".
Gibberish Email Address: We check to ensure the address doesn't look
like a random email address. For example, email@example.com doesn't
pass the test.
Disposable Email Address: We check if the email address has a domain
name used for temporary email addresses.
Webmail Email Addresses: We verify if the email address uses a webmail
like Gmail or Yahoo.
Presence of MX Records: We check if there are MX records on the
domain. If there aren't, the email address can't receive emails.
Presence of SMTP Server: This check is successful if we are able to
connect to the SMTP server (indicated in MX records).
SMTP Check: We test the email address and see if it bounces or not, without
sending an email.
Accept-all Domain: We check if the server has a catch-all policy that
accepts all the email addresses.
Can a "Valid" email address bounce?
The email addresses recently verified and marked "Valid" are safe to use.
We usually observe a bounce rate lower than 1% for these email addresses.
What does it mean when an email address is marked "Accept all"?
When you perform an Email Verification, the result might be
"Accept all". Some email servers accept all the email addresses
on the same domain name, whether they have actually been created
or not. In similar cases, the Email Verifier can't confirm if the
tested email address actually exists and returns the "Accept all"
These email addresses are less safe to use than the email addresses
with the "Valid" status. To decide whether to use them, you need to
the level of risk you're willing to take.
For moderate risk, we recommend selecting only the highest-quality
email addresses by using the confidence score returned by the Email
Verifier. For example, you can keep only email addresses with score
higher than 80%.