The mailfloss email verification API allows you to add email verification to any part of your software, ideal for signup, registration, onboarding, and other points of entry.

You will need an API key and an account with mailfloss to use the API. The API key can be generated inside of the mailfloss dashboard.

The API is not suitable for use in client-side scripts (e.g. React, Angular, Vue, jQuery, and other Javascript frameworks) because our verification endpoints do not allow cross-domain requests. Using it directly in the browser would require exposing sensitive API credentials giving anyone access to your account. Please make all requests server-side.

Make API calls on the server-side only

Email Verification API

API Overview

Authentication

mailfloss

Webhooks

Webhooks Overview

Reference

Rate Limits

Managing Webhooks

Response Headers

Code Examples

Response Codes

Event Triggers

Retries and Errors

Verifying Webhooks

mailfloss API & Webhooks