What potential pitfalls should developers be aware of when using PHP for email functionality?

Potential pitfalls when using PHP for email functionality include insecure handling of user input, which can lead to vulnerabilities like email header injection or cross-site scripting attacks. To mitigate these risks, developers should always sanitize and validate user input before using it in email functions. 

// Sanitize and validate user input before using it in email functions
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
if(filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Proceed with sending the email
} else {
    // Handle invalid email input
}

Keywords

SMTP email headers spam filters email validation PHPMailer

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