What potential pitfalls should be avoided when implementing a newsletter script with PHP/MySQL?

Potential pitfalls to avoid when implementing a newsletter script with PHP/MySQL include not sanitizing user input properly, not handling errors effectively, and not securely storing sensitive information such as passwords. To mitigate these risks, always use prepared statements to prevent SQL injection attacks, implement proper error handling to provide meaningful feedback to users, and use secure hashing algorithms to store passwords securely. 

// Example of using prepared statements to prevent SQL injection attacks
$stmt = $pdo->prepare("INSERT INTO newsletter_subscribers (email) VALUES (:email)");
$stmt->bindParam(':email', $email);
$stmt->execute();
```

```php
// Example of implementing error handling to provide meaningful feedback to users
if ($stmt->execute()) {
    echo "Successfully subscribed to the newsletter!";
} else {
    echo "An error occurred. Please try again later.";
}
```

```php
// Example of using password_hash() to securely store passwords
$password = "password123";
$hashed_password = password_hash($password, PASSWORD_DEFAULT);

Keywords

SQL injection XSS attacks email deliverability cron jobs database normalization

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