When I send bulk mail to all of my subscribers , how do I detect successful delivery or bounce? Suppose a few emails on subscriber list are not valid or do not exist, how we can detect that in php?
if sending read receipts is enabled, is that you need to include a new line at the end of every line:
$email_header .= "Disposition-Notification-To: $from
";
$email_header .= "X-Confirm-Reading-To: $from
";