What security considerations should be taken into account when using PHP for email management?

When using PHP for email management, it is important to sanitize and validate all user input to prevent against email injection attacks. Additionally, ensure that sensitive information such as email credentials are not hardcoded in the code and are instead stored securely in environment variables or configuration files. Finally, use secure email protocols such as SMTP with encryption to protect the transmission of emails. 

// Sanitize and validate user input
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);
if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    die("Invalid email address");
}

// Store email credentials securely
$host = getenv('EMAIL_HOST');
$username = getenv('EMAIL_USERNAME');
$password = getenv('EMAIL_PASSWORD');

// Use secure email protocol
$transport = (new Swift_SmtpTransport($host, 587, 'tls'))
    ->setUsername($username)
    ->setPassword($password);

$mailer = new Swift_Mailer($transport);

Keywords

SQL injection cross-site scripting input validation secure sockets layer (SSL) email headers.

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