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

# Introduction

> Paubox is HIPAA compliant, HITRUST certified, email infrastructure. Send transactional email, run marketing campaigns, and collect patient data via forms, all without worrying about PHI exposure.

## Which product is right for me?

| I want to…                                      | Use…                                 |
| :---------------------------------------------- | :----------------------------------- |
| Send transactional email from my app            | [Email API](/email-api/quickstart)   |
| Run email campaigns to patient lists            | [Marketing API](/marketing)          |
| Collect patient intake or consent data          | [Forms API](/forms/index)            |
| Send from the terminal or CI pipeline           | [CLI](/cli/quickstart)               |
| Use Paubox from Claude or AI agents             | [MCP Server](/mcp-server/quickstart) |
| Use Paubox from my app (Go, Node, Python, etc.) | [SDKs](/sdks)                        |

## Products

<CardGroup cols={2}>
  <Card title="Email API" icon="envelope" href="/email-api">
    Send transactional, HIPAA-compliant email via REST or SMTP
  </Card>

  <Card title="Marketing API" icon="bullhorn" href="/marketing">
    Campaigns, drip sequences, subscribers, and analytics
  </Card>

  <Card title="Forms API" icon="clipboard" href="/forms/index">
    Collect patient data via HIPAA-compliant secure forms
  </Card>

  <Card title="CLI" icon="terminal" href="/cli/index">
    Send email and check delivery from the terminal or CI
  </Card>

  <Card title="MCP Server" icon="plug" href="/mcp-server/index">
    Give AI assistants access to Paubox Email and Forms tools
  </Card>
</CardGroup>

## Get started

<CardGroup cols={2}>
  <Card title="Quickstart guide" icon="rocket" href="/email-api/quickstart">
    Four steps to your first email
  </Card>

  <Card title="API conventions" icon="lock" href="/email-api">
    Auth, formatting, and response codes
  </Card>

  <Card title="REST API" icon="shield-check" href="/email-api/messages">
    Send email via HTTP
  </Card>

  <Card title="SMTP API" icon="key" href="/email-api/smtp">
    Send email via SMTP
  </Card>
</CardGroup>

## Quickstart by language

<CardGroup cols={3}>
  <Card title="C#" icon="code" href="/csharp-sdk/quickstart" />

  <Card title="Go" icon="code" href="/go-sdk/quickstart" />

  <Card title="Java" icon="java" href="/java-sdk/quickstart" />

  <Card title="Node.js" icon="node-js" href="/node-sdk/quickstart" />

  <Card title="Perl" icon="code" href="/perl-sdk/quickstart" />

  <Card title="PHP" icon="php" href="/php-sdk/quickstart" />

  <Card title="Python" icon="python" href="/python-sdk/quickstart" />

  <Card title="Rails" icon="gem" href="/rails-sdk/quickstart" />

  <Card title="Ruby" icon="gem" href="/ruby-sdk/quickstart" />

  <Card title="Rust" icon="code" href="/rust-sdk/quickstart" />
</CardGroup>

## Building an SDK or integration?

Start with our OpenAPI specs: point your generator, AI agent, or editor at them directly.

<CardGroup cols={2}>
  <Card title="Email API OpenAPI spec" icon="file-code" href="/openapi1.yaml">
    Transactional email: `api.paubox.net/v1/{username}`
  </Card>

  <Card title="Marketing API OpenAPI spec" icon="file-code" href="/openapi2.yaml">
    Campaigns, subscribers, analytics: `api.paubox.net/v1/orca/{username}`
  </Card>
</CardGroup>

## Need help?

<CardGroup cols={4}>
  <Card title="GitHub" icon="github" href="https://github.com/Paubox">
    SDK source and issues
  </Card>

  <Card title="Status" icon="signal" href="https://status.paubox.com">
    System uptime
  </Card>

  <Card title="Support" icon="life-ring" href="https://www.paubox.com/contact-us">
    Contact the team
  </Card>
</CardGroup>