What are the potential pitfalls of using PHP to interact with email servers for business purposes?

One potential pitfall of using PHP to interact with email servers for business purposes is the lack of security measures in place, leaving sensitive information vulnerable to attacks. To mitigate this risk, it is important to ensure that the PHP code is properly sanitized and validated to prevent SQL injection and other security vulnerabilities.

// Example of sanitizing user input
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);