Check-Mail is a developer-focused service offering a free API to validate email addresses and identify disposable or temporary email accounts. Designed for real-time use, it helps businesses check sign-ups, reduce fraudulent registrations and spam, and improve the quality of email lists. The API checks email formatting and MX records, uses blacklists and heuristic detection to flag risky addresses, and returns validation results, a risk score, and a block recommendation in JSON. Developers can make a simple GET request with an email address or domain; the website’s own checker tests domains, while the API supports full email addresses.

Check-Mail highlights speed and availability, reporting uptime above 99.9% and load balancing across multiple servers. Its free tier includes 1,000 requests per month, with no credit card required, and paid plans for higher-volume use start at $50 per month. The service can support newsletter list cleaning, typo detection during sign-up, and checks that help prevent disposable-email abuse.