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

# Introduction

> Email validation and bounce prevention for developers

Relaybase is an email validation API that checks whether an email address is real and deliverable before you send to it catching typos, disposable domains, role-based addresses, and undeliverable mailboxes before they hurt your sender reputation and bounce rate.

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Make your first API request in a few minutes.
  </Card>

  <Card title="Validate an Email" icon="envelope" href="/api-reference/email/single-validation">
    See the full single-validation request and response reference.
  </Card>

  <Card title="Validation Results" icon="circle-check" href="/concepts/validation-results">
    Understand how Relaybase classifies and scores an email.
  </Card>

  <Card title="Plans & Usage" icon="credit-card" href="/plans/plans-and-usage">
    See what's included on each plan.
  </Card>
</CardGroup>