<?php 
$mbox = imap_open ("{server:143}", "login", "password");

echo "<p><h1>Headers in INBOX</h1>\n";
$headers = imap_sort($mbox, 'SORTDATE', '0', SE_UID);;

if ($headers == false) {
    echo "Call failed<br>\n";
} else {
    while (list ($key,$val) = each ($headers)) {
        echo $val."<br>\n";
    }
}

imap_close($mbox);

?>

imap_sort function fails if mailbox is very huge(6000 messages) and nothing is returnd to browser so it shows "The page cannot be displayed" error!
Please let me know if any help or advices available.
Thanks.
Elnar C Hajiev.