Email Verification API | Address validation service | WhoisXML API
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WHOIS / WHOIS History
WHOIS / WHOIS History

Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.

DNS / DNS History
DNS / DNS History

Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.

IP Geolocation / IP Netblocks
IP Geolocation / IP Netblocks

Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Access our web-based solution to dig into and monitor all domain events of interest.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.

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Enterprise API Packages
Enterprise API Packages

Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.

Security Intelligence (SI) Suite
Security Intelligence (SI) Suite

Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.

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Premium API Services

Enjoy priority data access with our premium API services topped with extra perks including dedicated team support, enterprise-grade infrastructure, and SLAs for full scalability and high performance.

Threat Intelligence Analysis
Threat Intelligence Analysis

Carry a complete threat intelligence analysis for a given domain or IP address and get access to a report covering 120+ parameters including IP resolutions, website analysis, SSL vulnerabilities, malware detection, domain ownership, mail servers, name servers, and more.

Threat Intelligence APIs
Threat Intelligence APIs

Gather threat intelligence via API calls covering Domain’s Infrastructure analysis, SSL Certificates Chain, SSL Configuration Analysis, Domain Malware Check, Connected Domains, and Domain Reputation Scoring.

Threat Intelligence Data Feeds
Threat Intelligence Data Feeds

Bolster enterprise security with our feeds covering Typosquatting domains, Disposable domains, Phishing URLs, Domain & IP reputation, Malicious URLs, Botnet C&C, and DDoS URLs.

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#1 Email Verification API to verify the existence, validity & quality of any email address

Our Email Verification API performs a comprehensive validation of email addresses in real-time and conveniently. Verify the email addresses coming from new user registrations, reduce email bouncing, block spam, and more.

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

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

Our email validation service via API calls checks:

  • Syntax

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

  • If the address is branded

    Check if the address is custom and linked to a business email account or if it is generic and coming from a free email service.

  • If the address is disposable

    Check if the email address is supplied by a known disposable email address provider such as Mailinator, 10MinuteMail, GuerrillaMail, and 2,000+ more.

  • Mail server existence

    Check for the availability of email addresses’ corresponding domains by ensuring the existence of DNS MX records.

  • Mailbox existence

    Check if the email address exists and can receive emails via the Simple Mail Transfer Protocol (SMTP) through email-sending emulation techniques.

  • Use as a catch-all email address

    Check if the email address can receive emails for more than one email address.

What is an Email Verification API?

An email verification API, also known as an email validation API, is a means for developers and product architects to integrate email checking capabilities into existing software and applications via API calls using different programming languages.

What isEmail VerificationAPI?

Practical usage

Improve marketing campaign results

Improve 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 email bouncing is sending to unverified email addresses.

By eliminating bounced emails and utilizing email verification and email validation tools, you can increase your sender score and email campaign quality.

Ensure that users who sign up to your website have a valid and verified email address

  • You can use our email verification services to check that someone signing up to your service is doing so using a business-branded email address.
  • Stay in touch with subscribers and use their verified email addresses to warn them of their payment card expiration, send them receipts, offer them new features or products, and more.
  • Enables your users to reset their password securely should they forget it.
  • Helps verify someone’s identity automatically without relying on manual human checks.
Ensure that users who sign up to your website have a valid and verified email address
Segment potentially dangerous emails

Segment potentially dangerous emails

  • Keep potentially unverifiable email addresses such as disposable ones out of your contact list. Users signing up for freemium services with disposable email addresses may turn out to be abusers.
  • Avoid entanglements with cybercriminals and fraudsters who hide behind fake personal or business email addresses.
Disposable Email Domains Data Feed

Interested in lists of disposable email domains?

Use our disposable email domains data feed to catch potential abusers red-handed. We provide reliable and up-to-date data in a format that is compatible with most systems.

Order 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

Integrating Email Verification API in a way that matches your system requirements is easy with our readily available client libraries.

Go to libraries
Email Verification API

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

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Enterprise API Packages

API access through WhoisXMLAPI can be purchased as an annual subscription. The access pricing is based on the number of queries, which is measured monthly with per-minute rate limits. The pricing structure gives predictability to business planning and solution architecture.

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Email Verification API Email Verification API

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