Email Verification & Validation API

Clean your email list and maintain list hygiene using Clearout's real-time email verification API. We help you prevent invalid and spam email addresses from entering your website forms or your database.

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Clearout Email Validation API Checks

Mailbox Error Verification

Mailbox Error Verification

Verifies all kind of mailbox errors without sending any payload to the given email address

Disposable Email Verification

Disposable Email Verification

Verifies the email addresses to check if it is from a disposable email provider

Syntax Validation

Syntax Validation

Fully cleans your email list by conforming invalid syntax to the standard format

MX Record Verification

MX Record Verification

Validates priority based MX records for available Mail Exchange servers to know the mailbox status

Extended SMTP Validation

Extended SMTP Validation

Verifies SMTP providers for every email address to determine the active mail servers

Catch-All Verification

Catch-All Verification

Identify the catch-all type addresses to avoid emailing thereby improving the overall deliverability hygiene

Duplicate Removal

Duplicate Removal

Removes all duplicate email addresses automatically and it comes free of cost

Role Account Verification

Role Account Verification

Identifies all role-based email addresses like admin, support or sales from the list

SpamTrap Detection

SpamTrap Detection

Multi-layered algorithm determining chances of an email address to be a spam trap!

Emails Verified
Disposable Domains Monitored
Bounce Rate Detected
Dollars Saved

Clearout Email Verification API Features

Guaranteed Deliverables

Instantly identify 100% valid email addresses in your result file, boosting the success rate of your email campaigns.

Real-time email verification via API

Seamlessly integrate our API with your forms/ CRM data flow to prevent spam leads from entering at the point of capture, ensuring clean and high-quality data.

Custom Allowlist/Blocklist

Take control of your email verification process by creating custom lists to allow or block specific email addresses or domains, tailored to your unique needs.

Track API usage

Stay informed about the performance of your email verification efforts with real-time insights on API usage and verification results, empowering you to make data-driven decisions.

Custom Email Verification Settings

Choose between the highest accuracy and fastest turnaround time based on your priorities. Opt for quicker validation checks when time is limited, ensuring efficient and effective email verification without compromising on quality.

email validation integration

Streamline your workflow

Connect Clearout with your existing tools to maintain the data accuracy and maximize your campaign ROI.

See all integrations

Advanced Security Measures

ISO Security Compliance Badge

ISO 27001:2013 Certified

Ensuring robust information security practices. Discover more about our certification and commitment to data security here.

Security Compliance SOC Badge

SOC 2 Type 2 Certified

Guaranteeing adherence to stringent data security standards. Explore our commitment to data integrity and privacy here.

Security Compliance GDPR Badge

GDPR Compliant

Compliant as both a Data Processor and Data Controller. Learn more about Clearouts GDPR compliance here.

Learn More about our API security & compliances

It works amazingly well at validating email addresses with great API and support. It was able to identify about 10% of the invalid contacts in our database. There are other products for email verification but Clearout by far has the best price and easiest to use.


Paul Mendoza

Co-founder, SigParser

Frequently Asked Questions

Our Email Verification API is optimized for speed and efficiency, typically delivering results half a millisecond for a free domain and a few milliseconds more for a business domain However, response time may vary depending on factors such as network latency and server load.

You can easily incorporate Clearout Email Verification API into your application through cURL, PHP, Java, NodeJS, Python, C#, Go, and R.

Our Email Verification API supports various file formats, including CSV and Excel (XLS/XLSX). Simply upload your file, and our API will efficiently verify the email addresses contained within it.

Absolutely. supports running the Email Verification API in EU regions, ensuring compliance with GDPR, and offering 24*7 support to our European clients.

Clearout Email Verification API employs robust security measures, including SSL encryption for data in transit and at rest, stringent authentication protocols, and compliance with privacy regulations like GDPR. These safeguards protect sensitive information from unauthorized access and ensure secure usage of the API.

Yes,'s API is designed to handle large volumes of email verification requests efficiently and reliably.

No, there is no limit to the number of emails that can be verified in a single request using's API. Additionally, multiple concurrent requests can be made to validate email addresses simultaneously.

Yes, we understand that integrating an API into your application can sometimes be challenging for few users. That's why offers comprehensive documentation, code examples, and dedicated support to help you seamlessly implement our Email Verification API. Additionally, our team is available to provide personalized assistance and guidance throughout the integration process.