Swift Email Validation API

Swift Email Verifier provides simple and powerful REST based real-time email validation API ( Application Programming Interface) without requiring you to upload your email addresses to our servers thereby GDPR & CCPA compliant. We do not log nor store any of the email addresses and all verifications are done in real-time.

email validation API

Validation Features

The most accurate and complete Email Validation Service

Syntax, Typo Check, Pwned, Fakes and Toxic Emails

Avoid common typo domain typo errors, fakes, toxic emails such as well known complainers, toxic or potential spam traps etc. We have a massive 900 Million+ potential spam trap database

Actual Mail Existence Check

Checks if the email address really exists and is able to receive mail.We perform full SMTP connection method to perform actual mailbox existence check.

Free Windows Program to consume the API

We provide a free Windows based program to consume the API. All you need is your API Key

Catch-All Domain, Disposable Email Check and Role Accounts

Detect toxic emails such as catchall, role accounts,
disposable emails and domains known for abuse and bot-created emails

The most transparent and accurate email validation service

Pay only for detected Valid and Invalid Emails, No charges for Unknown emails that we cannot validate!


We offer a powerful email validation API that can help you maximize your inbox delivery and improve your sender reputation. Our goal is to help you reduce bounces and complaints for your email marketing. Our services goes beyond validations; we can detect emails with Greylisting enabled, Catch-all emails, Role/Function accounts, Disposable Email Addresses and Temporary unavailability of email accounts and malicious/bogus email domains and emails including over 900 million known potential spam traps and complainers.

To verify emails with the API, simply signup and download an approriate API client below or integrate into your own application. Using the API endpoint is easy. All you need to do is perform a GET request using the schema: http://<API_Server_IP>/CheckEmail/<api_key>/<email_address>

Output will be displayed in JSON format.The API can also be consumed via one of the following:


Why to choose us

The real-time SMTP-based validation performs a complete and full verification by checking if an email address actually exist (actual mailbox existence) and can receive email (deliverable) at that specific moment in time.

Where we are unable to conclusively verify that an email address actually exists AND can receive email at that instant it was verified, we will respond back with an "Unknown" status. Unknown email address status do not attract any charges.

This checks the email addresses and ensures that they conforms to IETF standards and void of common typo domain typo errors using powerful email validation engine 

In addition, we have invested heavily in a massive 900+ million well known toxic/and potential spam traps and bad emails from various reputable sources that is integrated into the API.

This checks if the email domain will receive all of the email messages addressed to that domain, even if their addresses do not exist in the mail server. This offers the ability to detect potential Catch-all email domains. In addition, our API can detect role based email accounts such as admin@, support@, sales@ which are email addresses that are not associated with a particular person, but rather with a company, department, position or group. 

This checks if the email is provided by a known Disposable Email Address (DEA) provider such as Mailinator, 10MinuteMail, GuerrillaMail and about 2000 more. 

This checks the availability of the email address domain using DNS MX records 

This checks if the email address really exists . We use only real-time verification by employing SMTP connection method to accurately determine if an email address will bounce or non-existent. No historical data used.All validations is performed in real-time. Infact, we do not log nor store any of your email addresses since all emails are verified in real-time 100%. Therefore if you are interested in a real-time email validation API to use in your custom web/desktop application without sacrificing the privacy of your mailing lists, you have come to the right place!

API DOCUMENTATION Use our API documentation to integrate into your custom app

Some facts about us

99% Bounce Rate Reduction
24/7 Customer Support
M+ Emails Verified
99.9% Uptime

Plans & Pricing



150K Quota API Key

  • Non-Expiry Quota
  • 24/7 Access
  • Rotating API Server Pool
  • Detect >1B Toxic Emails



250K Quota API Key

  • Non-Expiry Quota
  • 24/7 Access
  • Rotating API Server Pool
  • Detect >1B Toxic Emails



500K Quota API Key

  • Non-Expiry Quota
  • 24/7 Access
  • Rotating API Server Pool
  • Detect >1B Toxic Emails



1 Million Quota API Key

  • Non-Expiry Quota
  • 24/7 Access
  • Rotating API Server Pool
  • Detect >1B Toxic Emails

Customer testimonials and Free Trial

Try before you purchase and clean up to 500 email addresses for free using our free trial option. Using the free trial option, you can clean up to 500 email addresses by using our easy Windows based API client.

The manual for the Windows based API client can be downloaded here.


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