PHP: Read emails from IMAP inbox

Write in PHP a simple script that connects to an IMAP inbox (localhost mail server), starts to read emails from the inbox one by one and echos to screen all email addresses it finds. The email addresses can be in the subject line, headers or content of the emails. You can use a RegExp to find the email addresses from the contents. The script continues to analyze the emails until there are no more emails left or if the script's execution time reaches 10 seconds. At this time, the script closes the connection to the IMAP and execution ends. There must be a variable $deleteEmails = false; in the beginning of the source code. If set to true, the script will delete the email after it has been analyzed. Only the email it has analyzed is deleted. If set to false, no emails are deleted. The script must be able to handle an IMAP inbox with over 4 GB worth of emails (over 100 000 emails). Naturally, I don't mean that the script must be able to process all these in 10 seconds, I mean that the script must be made in a way it doesn't try to loop through all emails when opening the inbox etc. For the record: I will use the script to process bounced emails. The inbox contains all email bounces and I want to extract from there the bounced email addresses so I will not send email again to those non-working, bounced emails again.