How to handle email address status in PHP?

[hqtrung]

I'm developing an email marketing system which allows users to send emails to multiple addresses. I have a list of tasks that need to be done, probably I will have many questions regarding to these tasks. Here's one of them: As I said, users are sending out emails to multiple addresses. I want to check for every sent out emails if the receipient address blocks the email and the reason of the block.Usually this is coming back to an email from Mail Delivery System. I think the solution has to be somewhere around the idea of checking the incoming emails somehow. Please help me finding the best solution.Thanks\[code\]**\[/code\]

• UPDATE:

**I'm going to update the content of the question. I forgot to say that these emails are sent our from a valid SMTP server with username and password, there should be a way to get the content of inbox from PHP somehow.