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What are the potential security risks associated with modifying PHP scripts to change the sender's email address?

Modifying PHP scripts to change the sender's email address can pose a security risk as it can be used for email spoofing or phishing attacks. To mitigate this risk, always validate and sanitize user input before using it to modify email headers.

php 
// Validate and sanitize the sender's email address
$sender_email = filter_var($_POST['sender_email'], FILTER_SANITIZE_EMAIL);

// Use the validated and sanitized email address in the mail function
$success = mail('recipient@example.com', 'Subject', 'Message', 'From: ' . $sender_email);
if($success) {
    echo 'Email sent successfully';
} else {
    echo 'Failed to send email';
}

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