---
title: Introduction
description: Learn how to send emails using Reloop SMTP relay.
---
> For the complete documentation index, see [llms-docs.txt](/llms-docs.txt) or the site index [llms.txt](/llms.txt). Full docs corpus: [llms-full-docs.txt](/llms-full-docs.txt). Prefer markdown URLs (append `.md`) for agent consumption. Product skill: [skill.md](/skill.md).


# SMTP Integration

Reloop provides a high-performance SMTP relay that allows you to send emails from any application, mail client, or framework that supports SMTP.

## SMTP Credentials

To connect to the Reloop SMTP server, use the following configuration settings:

| Setting | Value |
| :--- | :--- |
| **Host** | `smtp.reloop.sh` |
| **Port** | `587` (TLS) or `2525` / `25` |
| **Username** | Your Reloop API Key |
| **Password** | Your Reloop API Key |
| **Encryption** | SSL/TLS (`465`) or STARTTLS (`587`) |

## Code Examples

Configure standard SMTP library examples or explore step-by-step guides for your language:

<CardGroup cols={3}>
  <Card icon="siNodedotjs" title="Nodemailer (Node.js)">
    Standard Node SMTP using Nodemailer.
    <div className="mt-4 flex gap-4 text-xs font-semibold">
      <a href="/docs/examples/smtp/nodemailer" className="text-primary hover:underline">Read Guide →</a>
      <a href="https://github.com/reloop-labs/reloop-examples/tree/main/smtp-nodemailer" target="_blank" rel="noopener noreferrer" className="text-gray-500 hover:text-primary dark:text-gray-400 dark:hover:text-white hover:underline">GitHub ↗</a>
    </div>
  </Card>
  <Card icon="siPython" title="Python SMTP">
    Built-in smtplib Python SMTP.
    <div className="mt-4 flex gap-4 text-xs font-semibold">
      <a href="/docs/examples/smtp/python" className="text-primary hover:underline">Read Guide →</a>
      <a href="https://github.com/reloop-labs/reloop-examples/tree/main/smtp-python" target="_blank" rel="noopener noreferrer" className="text-gray-500 hover:text-primary dark:text-gray-400 dark:hover:text-white hover:underline">GitHub ↗</a>
    </div>
  </Card>
  <Card icon="siGo" title="Go SMTP">
    Built-in net/smtp Go implementation.
    <div className="mt-4 flex gap-4 text-xs font-semibold">
      <a href="/docs/examples/smtp/go" className="text-primary hover:underline">Read Guide →</a>
      <a href="https://github.com/reloop-labs/reloop-examples/tree/main/smtp-go" target="_blank" rel="noopener noreferrer" className="text-gray-500 hover:text-primary dark:text-gray-400 dark:hover:text-white hover:underline">GitHub ↗</a>
    </div>
  </Card>
  <Card icon="siPhp" title="PHP SMTP">
    Standard PHP SMTP connection.
    <div className="mt-4 flex gap-4 text-xs font-semibold">
      <a href="/docs/examples/smtp/php" className="text-primary hover:underline">Read Guide →</a>
      <a href="https://github.com/reloop-labs/reloop-examples/tree/main/smtp-php" target="_blank" rel="noopener noreferrer" className="text-gray-500 hover:text-primary dark:text-gray-400 dark:hover:text-white hover:underline">GitHub ↗</a>
    </div>
  </Card>
  <Card icon="siRuby" title="Ruby SMTP">
    Standard Ruby Net::SMTP integration.
    <div className="mt-4 flex gap-4 text-xs font-semibold">
      <a href="/docs/examples/smtp/ruby" className="text-primary hover:underline">Read Guide →</a>
      <a href="https://github.com/reloop-labs/reloop-examples/tree/main/smtp-ruby" target="_blank" rel="noopener noreferrer" className="text-gray-500 hover:text-primary dark:text-gray-400 dark:hover:text-white hover:underline">GitHub ↗</a>
    </div>
  </Card>
  <Card icon="siRust" title="Rust SMTP">
    Lettre SMTP library for Rust.
    <div className="mt-4 flex gap-4 text-xs font-semibold">
      <a href="/docs/examples/smtp/rust" className="text-primary hover:underline">Read Guide →</a>
      <a href="https://github.com/reloop-labs/reloop-examples/tree/main/smtp-rust" target="_blank" rel="noopener noreferrer" className="text-gray-500 hover:text-primary dark:text-gray-400 dark:hover:text-white hover:underline">GitHub ↗</a>
    </div>
  </Card>
</CardGroup>

<RelatedTopics>
  <RelatedTopic icon="key-new" title="API Keys Overview" href="/docs/learn/api-keys" />
  <RelatedTopic icon="code" title="All Examples Overview" href="/docs/examples" />
  <RelatedTopic icon="webhook" title="Webhooks Overview" href="/docs/webhooks" />
</RelatedTopics>