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

# Introduction

> thePurplebox, a powerful transactional email sending service for developers.

<CardGroup cols={2}>
  <Card title="Transactional Emails" icon="paper-plane" href="/api-reference/transactional">
    Start sending emails via API or SMTP
  </Card>

  <Card title="Custom domain" icon="globe" href="/configuration/domain">
    Verify your domain and start sending from your own email address
  </Card>
</CardGroup>