Are there alternative libraries or methods in PHP for handling email forwarding that may provide more robust functionality?

One alternative library in PHP for handling email forwarding is PHPMailer, which provides more robust functionality and features compared to the built-in mail() function. PHPMailer allows for easier customization of email headers, attachments, and SMTP settings, making it a more reliable option for sending forwarded emails.

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

// Instantiate PHPMailer
$mail = new PHPMailer(true);

try {
    // Server settings
    $mail->isSMTP();
    $mail->Host = 'smtp.example.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your@example.com';
    $mail->Password = 'yourpassword';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;

    // Recipients
    $mail->setFrom('from@example.com', 'Your Name');
    $mail->addAddress('recipient@example.com', 'Recipient Name');

    // Content
    $mail->isHTML(true);
    $mail->Subject = 'Forwarded Email';
    $mail->Body = 'This is the forwarded email content.';

    $mail->send();
    echo 'Email forwarded successfully';
} catch (Exception $e) {
    echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
}