Question about Unsuccessful delivery reports in sending bulk Emails

Question

I have database of approximately 10k users who have subscribed for newsletters. I am changing my site from asp to php. I am sending newsletters by cron job. I want to track the

Answer 1

In php when you sending mail with mail function you should check with condition

if(mail($to, $subject, $message, $headers)){ // Successfull mail delivery } else { // Code for un-successfull mailing }