Email Validator API

A developer-focused API to validate emails for syntax, domain existence, MX records, and deliverability signals, enabling safer signups and improved messaging.

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About This Tool

The Email Validator API offers both real-time and bulk checks to verify an email address's quality before use in forms, campaigns, and CRM imports. Core checks include syntax validation, DNS/MX lookups, and a lightweight deliverability signal to identify risky or disposable addresses.
Conceptually, a client sends a request containing the email and optional parameters such as mode (real-time or batch) and strictness. The service performs layered validations, may consult external data sources, and returns a structured JSON response with validity, a deliverability score, detected issues, and remediation guidance.
Who benefits includes developers building signup flows, product teams enforcing data hygiene, and marketing operations seeking clean lists. The tool's value lies in combining fast real-time replies with scalable batch processing, transparent scoring, and privacy-conscious options that help teams reduce bounces while preserving user experience.
Core features include syntax validation, DNS/MX verification, disposable-address detection, per-address scoring, batch validation, and configurable retention controls. Typical use cases cover form validation, lead qualification, list cleansing for campaigns, onboarding pipelines, and data-import validation in web and mobile apps.

How to Use

  1. Provide inputs: send a request with the target email address and optional parameters such as mode (real-time or batch) and strictness.
  2. Authenticate: include API key or bearer token according to your integration.
  3. Send request: call the endpoint with the email payload and optional parameters.
  4. Review outputs: parse validity, deliverability score, and any issue flags in the JSON response.
  5. Integrate: use results to gate signups, segment lists, or filter email campaigns.
  6. Handle errors: respect rate limits, retry logic, and observe privacy controls.
How to use email validator api

Frequently Asked Questions

Find Quick Answers

What does the API validate?
The API validates syntax, domain existence, MX record presence, and deliverability signals. It returns a structured result with a boolean validity flag, a confidence score, and optional reasons to identify why an address is questionable. It does not guarantee inbox delivery.
Can I validate lists in bulk?
Yes. Bulk validation accepts large lists via a batch endpoint or file upload. It processes addresses in batches, applies rate limits, and returns per-address results with identical fields as real-time checks. You can download results for cleansing or CRM imports.
How is privacy handled?
Requests are processed with encryption in transit and can be configured to avoid storing personal data beyond logs. Batch processing offers ephemeral storage options, and you can purge results after export. Compliance depends on your integration and data retention policy.
What is the typical response time?
Real-time checks return in a few tens to a few hundred milliseconds per address, depending on latency and data sources. Bulk validation uses queuing and parallelism to provide timely results, with progress indicators in the response.

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