What potential issues could arise when trying to implement a newsletter system on a website using PHP?

Issue: One potential issue could be ensuring that the newsletter system securely stores and manages subscriber information to protect user privacy. 

// Implementing encryption for storing subscriber emails
$email = $_POST['email'];
$encrypted_email = password_hash($email, PASSWORD_DEFAULT);
// Store $encrypted_email securely in database

Keywords

SMTP PHPMailer spam filters email deliverability database integration

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