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

# Send emails using PHPMailer with SMTP

> Learn how to send your first email using PHPMailer with SMTP.

## Prerequisites

Before you start, you'll need:

* A Resend [API key](/create-an-api-key)
* A [verified domain](/add-a-domain)

## 1. Install

Get the [PHPMailer](https://github.com/PHPMailer/PHPMailer) package.

<CodeGroup>
  ```bash php theme={"theme":{"light":"github-light","dark":"vesper"}}
  composer require phpmailer/phpmailer
  ```
</CodeGroup>

## 2. Send email using SMTP

When configuring your SMTP integration, you'll need to use the following credentials:

* **Host**: `smtp.resend.com`
* **Port**: `587`
* **Username**: `resend`
* **Password**: `YOUR_API_KEY`

Then use these credentials to send with PHPMailer:

```php theme={"theme":{"light":"github-light","dark":"vesper"}}
<?php

// Include Composer autoload file to load PHPMailer classes
require __DIR__ . '/vendor/autoload.php';

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

$mail = new PHPMailer(true);

try {
    $mail->isSMTP();
    $mail->Host = 'smtp.resend.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'resend';
    $mail->Password = 're_xxxxxxxxx';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;

    // Set email format to HTML
    $mail->isHTML(true);

    $mail->setFrom('onboarding@resend.dev');
    $mail->addAddress('delivered@resend.dev');
    $mail->Subject = 'Hello World';
    $mail->Body = '<strong>It works!</strong>';

    $mail->send();

    // Log the successfully sent message
    echo 'Email successfully sent';
} catch (Exception $e) {
    // Log the detailed error for debugging
    error_log('Mailer Error: ' . $mail->ErrorInfo);
    // Show a generic error message to the user
    echo 'There was an error sending the email.';
}
```

## 3. Try it yourself

<Card title="PHPMailer SMTP Example" icon="arrow-up-right-from-square" href="https://github.com/resend/resend-phpmailer-smtp-example">
  See the full source code.
</Card>