Email Verification | #1 email verifier & validator | WhoisXML API

#1 Email Address Verification and Validation Services

Tired of bounced messages and invalid email addresses? Boost email marketing results and get rid of abusers with our complete email verification product line—API, web-based lookup tool, bulk processing capabilities, and disposable email domains database.

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1,000 free API requests monthly. No credit card required.

For every email, our email verification and validation products answer these questions and others:

  • Is the syntax correct?

    Valid email addresses should conform to established IETF standards. We check for this via a syntactic email validation engine.

  • Is the address custom?

    Email addresses used for business purposes are more likely to be branded and include a company's name.

  • Is the email address disposable?

    Chances are disposable email service providers do not supply valid email addresses. Mostly users with short-term needs use temporary email addresses.

  • Does the mail server exist?

    Valid email addresses should have a corresponding domain name with configured MX records. If not, these addresses might be inaccurate.

  • Does the mailbox exist?

    A valid email address should be able to receive messages. Our email verification products check for mailbox existence via email-sending emulation and SMTP connection checks.

  • Is it a catch-all email address?

    It’s unlikely for valid email addresses to be catch-all ones since these are not designed to reach a designated person.

Choose the email verification product that works best for you:

Email Verification Lookup

A hosted email verification tool to instantly verify the quality and validity of an email address via a lookup query.

Email Verification Lookup | WhoisXML API
Email Verification API | WhoisXML API

Email Verification API

Email Verification API thoroughly evaluates email addresses in an instant via API calls. We provide developer libraries for most programming languages to make integration quicker with less code to write.

Bulk Email Verification

Our online bulk email checker is easy to use. Just upload your email list for validation and download the results in your chosen format—XML, JSON, or CSV.

Email Verification Bulk API/GUI | WhoisXML API
Disposable Email Domains Data Feed | WhoisXML API

Disposable Email Domains

Get an exhaustive list of all disposable email domains in use to get rid of unwanted email addresses from your contact lists and more.

Our email validation process is:

  • Complete

    We cover email verification from many angles to significantly improve the quality and validity of your email lists as well as flag suspicious email addresses.

  • Timely

    Our data never gets old. We scan the Web daily to provide comprehensive information on all email domains.

Email Verification Overview

Get 1,000 free requests monthly. No credit card required.

Get started