# Docs

How to send email through Flyanote's API, for developers and AI agents. Start with the quick start: a test send is free, and never delivered.

* [Quick start](https://flyanote.com/docs/quickstart): send a free test message that's never delivered, then add and verify your sending domain.
* [API errors](https://flyanote.com/docs/errors): every code the API returns, and the steps that fix it.
* [The email format](https://flyanote.com/docs/email-format): the JSON document an email is written in.
* [Health checks](https://flyanote.com/docs/checks): what Flyanote checks in an email before it sends.
* [The OpenAPI document](https://flyanote.com/openapi.json): every operation, copied from the running API each time this site updates.
* [Developers and AI agents](https://flyanote.com/developers): what works today, and which steps need a person.

For agents: `llms.txt` lists every page, `llms-full.txt` has them all in one file, and any page's address with `.md` added is its Markdown.