Bounce Email handling with PHP?

Here is my scenario:

I have 2 email accounts: [email protected] and [email protected].

I want to send email to all my users with [email protected] but then “reply to” [email protected] (until here, my PHP script can handle it).

When, the email can’t be sent, it’s sent to [email protected], the error message could be 553 (non existent email …) etc.

My question is: How do I direct all those bounce emails (couldn’t-sent emails) to [email protected] through a handling script to check for the bounce error codes?

What programming language should I be using for the “handling script”?

What would the “handling script” look like? Can you give a sample?

in other words:

What are the procedures I should follow to handle the bounce email ?