Mailboxlayer

What Is Mailboxlayer?

Mailboxlayer is a developer-focused email verification API. It checks email addresses for syntax errors, typos, MX records, SMTP existence, and whether they are from free, disposable, or catch-all domains. Results return in lightweight JSON, helping apps separate real users from low-quality contacts.

Who Is It For?

It is built for developers, SaaS platforms, e-commerce stores, and marketing teams who need to validate emails at signup or in bulk. It is not for non-technical users who need a drag-and-drop interface — the API requires basic coding skills to integrate.

Real-World Use Cases

Use mailboxlayer to reduce bounce rates in email campaigns, block disposable emails during registration, and verify user lists before import. It powers apps in CRM, email marketing, and customer onboarding workflows.

• Syntax & Typo Check — Automatically catch common email typos and suggest corrections.
• Real-Time SMTP Verification — Confirm an email address actually exists on the receiving server.
• Free & Disposable Email Detection — Filter out temporary or throwaway addresses using a daily updated provider database.
• Catch-All Detection — Identify domains that accept all emails, reducing false positives.
• Deliverability Score — Get a quality score from 0 to 1 to prioritize high-value contacts.
• 256-bit HTTPS Encryption — All API requests are secured end-to-end.
• Interactive Documentation — Test API endpoints live within the docs.