How can the PHP mail function be used to receive a read receipt or delivery confirmation?

The PHP mail function does not natively support read receipts or delivery confirmations. To achieve this functionality, you would need to implement a workaround such as embedding a tracking pixel in the email content and monitoring when it is loaded. This can be done by generating a unique tracking image URL for each email sent and tracking when that URL is accessed. 

```php
$to = 'recipient@example.com';
$subject = 'Email Subject';
$message = 'Email Content with Tracking Pixel <img src="https://yourdomain.com/tracking.php?email=recipient@example.com&timestamp=' . time() . '" width="1" height="1">';
$headers = 'From: yourname@example.com' . "\r\n" .
    'Reply-To: yourname@example.com' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

mail($to, $subject, $message, $headers);
```

In the code snippet above, the email content includes an image tag with a source pointing to a tracking script (tracking.php) on your server. This script can log the email recipient, timestamp, and any other relevant information for tracking purposes.

Keywords

PHP mail function read receipt delivery confirmation email tracking SMTP server

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