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Email Verification API

#1 Email Address Verification and Validation Services·emailverification.whoisxmlapi.com

Email Verification API is a cloud-based service that checks the validity and quality of email addresses via API calls. It evaluates syntax correctness, whether an address is disposable, whether the domain's mail server exists, whether the mailbox actually exists via SMTP checks, and whether the address is a catch-all. It is part of a broader email verification product line that also includes a hosted lookup tool, bulk verification, and a disposable/free email domains database.

What it's for

Verify or validate customer and potential client email addresses so they receive marketing messagesKeep disposable and unverifiable email addresses out of contact listsReduce email bounces to improve sender score and email marketing campaign qualityEnsure payment card expiration notices, receipts, and marketing offers reach legitimate inboxesHelp users reset passwords by validating input email addresses

Features 13

API output in JSON or XML format
Bulk email verification with upload and download in XML, JSON, or CSV
Catch-all email address detection
Configurable checks: validateDNS, validateSMTP, checkCatchAll, checkFree, checkDisposable
Daily web scanning to keep email domain data current
Detection of custom/branded business email addresses
Developer libraries for most programming languages
Disposable and free email domains database
Disposable email address detection
Email syntax validation against IETF standards
Hosted email verification lookup tool
Mail server (MX record) existence check
Mailbox existence verification via email-sending emulation and SMTP connection checks

At a glance

free tierfree trialAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Fordevelopers, email marketers

CompanyWhoisXML API

Integrations

Postman

Resources

Docs

Pricing

Only a free plan with 100 queries is described in detail; paid plan prices are not shown in the available content, and enterprise packages are offered as annual subscriptions with pricing available on request.

FreeFree

Automatically granted after sign-up; no credit card required.

100 free queries/API requests