Is it possible to receive read receipts or notifications for invalid email addresses when sending bulk emails using PHPMailer?

When sending bulk emails using PHPMailer, it is not possible to receive read receipts or notifications for invalid email addresses. However, you can handle bounced emails by setting up a bounce email address to receive notifications of delivery failures. This way, you can track which email addresses are invalid and update your mailing list accordingly.

// Set up a bounce email address to receive notifications of delivery failures
$mail->addCustomHeader('Return-Path', 'bounces@example.com');