> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sentfrom.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Introduction

> Email infrastructure for AI agents — inboxes, sending, receiving, threading, and webhooks in one API.

SentFromAI gives your AI agents a real email address. Create inboxes on demand, send
and receive mail, follow conversations as threads, and react to incoming email in
real time over webhooks — all from one clean API (or natively as agent tools over
[MCP](/guides/mcp)).

<CardGroup cols={2}>
  <Card title="Quickstart" icon="bolt" href="/quickstart">
    Create an inbox and send your first email in under five minutes.
  </Card>

  <Card title="Authentication" icon="key" href="/authentication">
    API keys, the base URL, and how requests are authenticated.
  </Card>

  <Card title="Receiving email" icon="inbox" href="/concepts/receiving">
    Get inbound mail and delivery events delivered to your endpoint.
  </Card>

  <Card title="API reference" icon="code" href="/api-reference/introduction">
    Every endpoint, request, and response.
  </Card>

  <Card title="MCP server" icon="plug" href="/guides/mcp">
    `npx -y sentfromai-mcp` — email as 21 native tools in any MCP-capable agent.
  </Card>

  <Card title="Agent frameworks" icon="robot" href="/frameworks/overview">
    Recipes for OpenClaw, LangChain, CrewAI, Vercel AI SDK, and more.
  </Card>
</CardGroup>

## What you can build

* **Support & sales agents** that own an inbox, triage incoming mail, and reply in-thread.
* **Per-user inboxes** — spin up a fresh address for every customer, task, or workflow.
* **Transactional senders** — invoices, receipts, alerts, with deliverability handled for you.
* **Anything that reads or writes email**, without standing up SMTP/IMAP or managing reputation.

## How it works

<Steps>
  <Step title="Create an inbox">
    `POST /inboxes` returns an address like `support-bot@mail.sentfrom.ai` — ready
    to send and receive immediately on the shared domain.
  </Step>

  <Step title="Send & receive">
    Send with `POST /messages`. Inbound mail is parsed, threaded, and POSTed to
    your webhook (or polled via `GET /messages`).
  </Step>

  <Step title="Stay in thread">
    Replies and forwards keep correct `In-Reply-To`/`References` headers, so
    conversations thread cleanly in every mail client.
  </Step>
</Steps>

## Deliverability, handled

Every SentFromAI domain ships with **SPF, DKIM, and DMARC** configured, automatic
**bounce/complaint suppression**, and reputation isolation on higher plans. You
focus on the agent; we keep the mail landing in the inbox.

<Note>
  Base URL: `https://api.sentfrom.ai/v1`. All requests use a
  Bearer API key — see [Authentication](/authentication).
</Note>