API archive entry · source-reported
Mailfornet
Disposable inboxes for end-to-end signup tests, with long-polling and HMAC-signed webhooks
Other Email APIs
These records share a directory category and are ordered by similarity of reported access facts. They are a shortlist, not proof of drop-in compatibility.
Cloudmersive Validate
Validate email addresses, phone numbers, VAT numbers and domain names
API key · HTTPS reported · CORS Yes
Email Validation
Validate email addresses for deliverability and spam
API key · HTTPS reported · CORS Yes
EmailJS
Send emails directly from client-side JavaScript without a backend server
API key · HTTPS reported · CORS Yes
Kiprio Email Validate
Free email validation: MX check, disposable detection, syntax
API key · HTTPS reported · CORS Yes
SMTPfast
Send transactional email, manage contacts and broadcasts, free 3,000 emails/month
API key · HTTPS reported · CORS Yes
Verifier
Verifies that a given email is real
API key · HTTPS reported · CORS Yes
How to compare them
Coverage
Compare exact endpoints, fields, geography, history, and update frequency.
Operating cost
Model request volume, caching, overages, support, and migration cost.
Integration risk
Test auth, errors, pagination, latency, versioning, and outage behavior.
Data rights
Review attribution, redistribution, retention, privacy, and commercial-use terms.
Source reference
This page separates source-reported facts from questions that need live provider verification.