fetching a mail box and finding bounced email address

Question

Hi,

I want to make a script which is fetching a mail box (that only got bounced emails) every 5 min. as cron job and finding the bounced email inside that mails. And then i can make database stuff with that bounced emails. I know there are some ready to use scripts for fetching mail box, i can use em, how can i find the bounced email address from that fetched mails ?

Thanks