What are the potential pitfalls of using external form mailers like "dwmailer.pl" in PHP, and how can they be avoided?

One potential pitfall of using external form mailers like "dwmailer.pl" in PHP is that they may not be secure and could potentially expose your server to vulnerabilities such as injection attacks. To avoid this, it is recommended to use PHP's built-in mail() function to send emails securely. 

<?php
// Example of sending an email using PHP's built-in mail() function
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com";

// Send email
if(mail($to, $subject, $message, $headers)) {
    echo "Email sent successfully.";
} else {
    echo "Email sending failed.";
}
?>

Keywords

external form mailers dwmailer.pl security vulnerabilities data validation PHP mail() function

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