#1 Email Verification API Service - Email Address Validation Tool | Whois XML API

Verify the existence, validity & quality of any email address

Our Email Verification API performs comprehensive validation of e-mail addresses in real-time in a very convenient manner. Verify email address of new user registrations, reduce email bouncing, block spam and more…

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1000 free requests monthly. No credit card required.

301,014,459Email addresses verified
2,489Satisfied customers
18,016,895Bounce backs prevented

For every email address, we check

  • Syntax

    Check if the email address conforms to the IETF standards by using a complete syntactic email validation engine.

  • Typos and curse words

    Check the email address against for common typos regarding popular email domains. Check fake email patterns.

  • Disposable email address

    Check if the email address is supplied by a known Disposable Email Address provider such as Mailinator, 10MinuteMail, GuerrillaMail and 2000+ more.

  • Mail server existence

    Check the availability of the email address domains by using DNS MX records.

  • Mailbox existence

    Check if the email address exists and can receive emails by using SMTP connection and email-sending emulation techniques.

  • Catch-all email address

    Check if the email address can receive emails for any number of other email addresses.

What isEmail VerificationAPI?

Practical usage

Increase marketing campaign results

Increase marketing campaign results

In email marketing, it is important that the emails you send are verified, validated, and received by customers. One of the most common causes of bounced emails is sending them to unverified email addresses. Email campaign providers may close the business account when emails regularly bounce. By eliminating bounced emails and utilizing email verification and email validation tools you can increase your sender score and email campaign quality.

Ensure the users who sign up on your website have a valid and verified email address

  • Catches user typos with email validation when they’re entering their email address and prompts the user to fix typos before allowing them to register.
  • Lets you stay in touch with your users knowing you have a verifiable email address for: credit card expiration, receipts, new features and offerings, etc.
  • Ensures that your users can reset their password securely if forgotten: without email address verification and validation, there’s no way to validate someone’s identity outside of manual human verification.
Ensure the users who sign up on your website have a valid and verified email address
Segment potentially dangerous emails

Segment potentially dangerous emails

  • Prevent users from signing up for your website with disposable email addresses by using our email validation API tool. Users who sign up for these services usually try to bypass giving you their real email for a specific reason: maybe they want to abuse your freemium features, etc.
  • By ensuring you only allow users with real verifiable personal or business email addresses to register, you reduce the risk of abuse on your website.
Disposable Email Domains Data Feed

Disposable Email Domains Data Feed

Get a complete list of current disposable email domains. We provide the most relevant data in a suitable format.

Request database

Simplify your work

Email Verification client library in PHP language Node.js Email Verification client library Email Verification client library in Python language Flask Email Verification client library Express.js Email Verification client library

To make coding against Email Verification API easier, use client libraries that reduce the amount of code you need to write.

Go to libraries
Email Verification API

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

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