End-to-End Automated Email Testing API

How it works

Mailstack allows you to easily create unlimited mailboxes and API keys for testing email workflows. Once registered, you get a default mailbox and API key to access it.
You can send test emails using a format like {tag}.{mailboxid}@mailstack.expandtesting.com, where tag is any identifier (e.g., username, team) and mailboxid is your unique mailbox reference.

The Mailstack API enables you to retrieve emails via REST, offering real-time options to wait for new emails or retrieve them immediately. All interactions are managed via a simple, secure API.