---
title: Authentication
slug: email-verification-authentication
docTags: 
createdAt: 2026-06-16T03:07:41.730Z
---

:::hint{type="warning"}
## Legacy API — sunsets June 1, 2027

This page documents the original mailfloss API, which is being retired on **June 1, 2027**. New integrations should use the [v1 API](https://developers.mailfloss.com/quickstart).
:::

All of your requests needs to be authenticated with your API key and passed in as a query parameter `api_key`.

API keys can be generated and found in the mailfloss dashboard under the API section [https://app.mailfloss.com/api](https://app.mailfloss.com/api)