> ## Documentation Index
> Fetch the complete documentation index at: https://openmail-docs-reputation-lifecycle-webhooks.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Complete reference for the OpenMail REST API — create and manage inboxes, send messages, read threads, handle attachments, and configure webhooks.

Welcome to the OpenMail API. Our API is organized around REST. It has predictable resource-oriented URLs, accepts JSON-encoded request bodies, and returns JSON-encoded responses.

**Base URL:** `https://api.openmail.sh`

<CardGroup cols={2}>
  <Card title="API Overview" icon="list" href="/api-reference/overview">
    Base URL, error format, and common error codes
  </Card>

  <Card title="Authentication" icon="key" href="/api-reference/authentication">
    Bearer token and API key setup
  </Card>

  <Card title="Inboxes" icon="inbox" href="/api-reference/overview">
    Create, list, get, and delete inboxes
  </Card>

  <Card title="Messages" icon="paper-plane" href="/api-reference/overview">
    Send email, list messages, and manage threads
  </Card>
</CardGroup>

## Quick reference

<ResponseField name="Authentication" type="string">
  `Authorization: Bearer om_...`
</ResponseField>

<ResponseField name="Idempotency" type="string">
  Send endpoint requires `Idempotency-Key` header (UUID)
</ResponseField>

<ResponseField name="Webhooks" type="string">
  See [Setup](/guides/webhooks) for payload and signature verification
</ResponseField>

<ResponseField name="Rate limits" type="string">
  100 inbox creations/day; 10 sends/min and 200/day per inbox
</ResponseField>