Free-tier email verification

IntoDNS.ai

IntoDNS.ai is a DNS and email security scanner that runs deterministic checks against a domain and returns evidence for SPF, DKIM, DMARC, DNSSEC, MTA-STS, BIMI, FCrDNS, blacklists, and selected web se...

DKIMValidator.com is a web-based email validation service that accepts messages sent to any address at @dkimvalidator.com and then reports DomainKeys, DKIM, SPF, and SpamAssassin results in one place....

EmailLabs

EmailLabs is a cloud-based SMTP relay and email REST API service for sending transactional and marketing email. The service supports SMTP and RESTful API access, email templates, basic and advanced an...

Abstract Email Validation API

Abstract API’s Email Validation and Verification API provides real-time email verification designed to help teams reduce bounce rates, clean signup forms, and improve the quality of inbound leads. It ...

UserCheck

UserCheck is an email validation API that checks addresses and domains for disposable mail providers, forwarding services, public email domains, role accounts, MX record validity, syntax errors, and c...

uChecker

uChecker is an online email verification service for validating individual addresses and cleaning bulk lists through syntax checks, DNS and MX lookup, and SMTP mailbox verification. It supports upload...

Verifalia

Verifalia is an email verification API that checks addresses in real time and in batch through an HTTPS REST API that uses JSON. It supports integration into web forms, apps, CRMs, POS systems, and other data-entry points, and it provides SDKs for .NET, Java, JavaScript, Ruby, PHP, and Go.

Free Mail Tester

Free Mail Tester is a web-based email deliverability checker that generates a unique test address, accepts a message sent from a real mail client or campaign tool, and returns a 0–100 score with analy...

Temp Mail Detector

Temp Mail Detector is an email validation API that checks whether a domain belongs to a disposable or temporary email provider. The service accepts a domain name, analyzes signals such as block-list s...

Verimail is an email address verification service that checks bulk lists and individual addresses through a REST API. It removes syntax errors, duplicates, invalid domains, disposable addresses, catch...

Antideo

Antideo provides APIs for IP address location, IP reputation, email validation, and phone number validation. The service exposes endpoints for IP geolocation, proxy and blacklist checks, disposable and generic email detection, and phone number validation with country, carrier, and time zone data.

EmailGuard API

EmailGuard API is an email validation service that checks addresses against live DNS and MX records, identifies disposable and role-based emails, and returns typo suggestions such as gmil.com to gmail.com. It is exposed as an API and can be used from a React component or backend form flow.

emailvalidation.io is an email validation and email finding service. It validates single addresses or uploaded lists in realtime, and it also exposes a REST API for form validation and bulk processing.

OrbiSearch

OrbiSearch is an email finder and verification API that finds work email addresses from a first name, last name, and company domain, then validates the result in real time against the live mail server. It also supports bulk CSV processing and a web app for single lookups and validation.

EmailQo Email Infrastructure Grader

EmailQo’s Email Infrastructure Grader is a web-based domain checker that evaluates email deliverability configuration in one click. It runs four checks against a domain: SPF, DKIM, DMARC, and MX records, then assigns a score out of 100 with each component worth 25 points.