What are common challenges when handling undelivered email notifications in PHP?

One common challenge when handling undelivered email notifications in PHP is determining the reason for the delivery failure, such as an invalid email address or a full mailbox. To address this, you can use the `swiftmailer` library in PHP to catch exceptions and errors when sending emails and handle them accordingly. 

// Require the Swift Mailer autoloader
require_once 'vendor/autoload.php';

// Create the Transport
$transport = new Swift_SmtpTransport('smtp.example.com', 25);

// Create the Mailer using your created Transport
$mailer = new Swift_Mailer($transport);

// Create a message
$message = (new Swift_Message('Subject'))
    ->setFrom(['john.doe@example.com' => 'John Doe'])
    ->setTo(['receiver@example.com' => 'Receiver Name'])
    ->setBody('Here is the message body.');

try {
    // Send the message
    $result = $mailer->send($message);
    echo 'Message sent successfully!';
} catch (Swift_TransportException $e) {
    echo 'An error occurred: ' . $e->getMessage();
}

Keywords

SMTP bounce handling email delivery PHPMailer error handling

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