What are the potential security risks associated with sending mass emails from a MySQL database using PHP?

One potential security risk is SQL injection, where malicious code can be injected into the email content or recipient list. To prevent this, use prepared statements with parameterized queries to sanitize user input before executing SQL queries. 

// Connect to MySQL database
$pdo = new PDO("mysql:host=localhost;dbname=database", "username", "password");

// Prepare SQL statement
$stmt = $pdo->prepare("INSERT INTO emails (recipient, subject, content) VALUES (:recipient, :subject, :content)");

// Bind parameters
$stmt->bindParam(':recipient', $recipient);
$stmt->bindParam(':subject', $subject);
$stmt->bindParam(':content', $content);

// Sanitize user input
$recipient = filter_var($_POST['recipient'], FILTER_SANITIZE_EMAIL);
$subject = filter_var($_POST['subject'], FILTER_SANITIZE_STRING);
$content = filter_var($_POST['content'], FILTER_SANITIZE_STRING);

// Execute query
$stmt->execute();

Keywords

SQL injection email headers SMTP authentication XSS attacks data encryption

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