What are the security considerations when implementing automated email functionality in PHP scripts?

When implementing automated email functionality in PHP scripts, it is important to consider security measures to prevent abuse such as spamming or injection attacks. One way to enhance security is to validate user input and sanitize email content before sending. Additionally, it is recommended to use SMTP authentication to prevent unauthorized access to the email server. 

// Example code snippet implementing security measures for automated email functionality

// Validate and sanitize user input
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Set up SMTP authentication
$transport = (new Swift_SmtpTransport('smtp.example.com', 587))
  ->setUsername('your_username')
  ->setPassword('your_password');

$mailer = new Swift_Mailer($transport);

// Create and send email
$message = (new Swift_Message('Subject'))
  ->setFrom(['your_email@example.com' => 'Your Name'])
  ->setTo([$email])
  ->setBody('Message body');

$result = $mailer->send($message);

Keywords

SQL injection cross-site scripting email headers injection PHPMailer encryption.

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