#1 Bulk Email Verification tool to validate thousands of emails at once

Verify the validity and existence of up to 50,000 email addresses in one go with our bulk email validation tool.

Choose file (*.csv)

Input file example: sample.csv Data source requirements & rules Result description

Easy bulk email validation API calls to verify that:

Convenient and hassle-free

There’s no need to validate email addresses one by one with our bulk email verification tool. You can upload up to 50,000 email addresses in one go, saving you time and effort.
Easy-to-use GUI

Our bulk email validation tool is not complicated. Simply upload your email list in CSV format and download the result in CSV, XML, or JSON formal—whichever suits you.
Precise and comprehensive email cleansing

The bulk email verification tool can detect email addresses from over 2,000 disposable email providers aside from checking for syntax, mail server & mailbox existence, if catch-all, and if coming from a free email service provider.

Practical usage

Improve email marketing metrics

Make it a habit to run your email marketing list through our bulk email verification tool to ensure that it is clean and free from invalid and nonexistent email addresses. The tool detects syntax errors and disposable email domains, which can drastically affect crucial email marketing metrics, such as open and bounce rates. By cleaning your email list, you can improve these metrics.

Minimize faulty signups and increase earning potential

Monitor your subscriber list for faulty signups using our bulk email validation tool. Abusive users may use invalid or disposable email addresses to take advantage of freemium features without the intention of upgrading their accounts. Legitimate users could also mistype their email addresses, making password resets and general communications difficult.

Boost threat hunting capabilities

Make email validation part of your cybersecurity best practices and detect threat actors who often use invalid and disposable email addresses to ensure anonymity when they launch spam and phishing campaigns.

Email Verification Bulk Lookup | WhoisXML API

Check our Bulk Email Verification API

Upload up to 50,000 email addresses via API call to get a verification request ID. Use this ID to check the status of your request and download the results.

Learn more about API integration

Kim Kok

Vice President

Core4ce

“We want to provide all Cyberscape users the ability to integrate relevant data for their cyber threat investigations. WhoisXML API provides unique data that will be helpful to the cyber threat investigation community, allowing analysts to shorten the cycle of understanding and mitigating threats.”

Oleg Danilov

Director of Marketing Services - Sales Excellence & Data Management

Herold

“WhoisXML API data helps us make informed and automated decisions, filtering invalid email addresses much faster.”

James Knight

Director

Broads Tours

“We needed a simple way of verifying the integrity of user-entered email addresses, and discovered WhoisXML API - it is great value and was really easy to integrate with our systems. Excellent customer service when required, too.”

WHOIS / WHOIS History

DNS / DNS History

IP Geolocation / IP Netblocks

Domain Research Suite (DRS)

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain Research Suite (DRS)

Research

Monitoring

White-Label

Predictive Threat Intelligence Feeds

Internet Infrastructure

Enterprise API Packages

Security Intelligence (SI) Suite

#1 Bulk Email Verification tool to validate thousands of emails at once

Easy bulk email validation API calls to verify that:

Convenient and hassle-free

Easy-to-use GUI

Precise and comprehensive email cleansing

Practical usage

Improve email marketing metrics

Minimize faulty signups and increase earning potential

Boost threat hunting capabilities

Check our Bulk Email Verification API

Have questions?