What potential pitfalls should be considered when using PHP to handle sensitive test data in emails?

When handling sensitive test data in emails using PHP, potential pitfalls to consider include ensuring that the data is encrypted before being included in the email body, using secure email transmission protocols like SMTP with SSL/TLS, and validating user input to prevent injection attacks. 

// Encrypt sensitive test data before including it in the email body
$sensitiveData = '1234567890';
$encryptedData = openssl_encrypt($sensitiveData, 'AES-256-CBC', 'secret_key', 0, 'random_iv');

// Use secure email transmission protocols like SMTP with SSL/TLS
$transport = (new Swift_SmtpTransport('smtp.example.com', 465, 'ssl'))
  ->setUsername('username')
  ->setPassword('password');

// Validate user input to prevent injection attacks
$email = filter_var($_POST['email'], FILTER_VALIDATE_EMAIL);
if($email){
  // send email
} else {
  echo 'Invalid email address';
}

Keywords

security encryption PHPMailer sensitive data data leakage

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