问如何跟踪退回的电子邮件？

EN

$inbox = imap_open('{imap.one.com:993/imap/ssl/novalidate-cert}INBOX', 'your@address.com', 'xxxxxxxx') or die('Cannot connect: ' . print_r(imap_errors(), true));

/* grab emails */
$emails = imap_search($inbox,'ALL');

/* if emails are returned, cycle through each... */
if($emails) {

    /* put the newest emails on top */
    rsort($emails);

    /* for every email... */
    foreach($emails as $email_number) {

        $message = imap_fetchbody($inbox,$email_number,2);

        $pieces = explode(" ", $message);

        foreach($pieces as $piece){

            $findme   = '@';
            //$findme2 = '.com';

            $pos = strpos($piece, $findme);

            if ($pos !== false) {
                    echo $piece;
            }


        }

    }

}