<?php //﻿ = UTF-8 BOM

header('Content-Type: text/plain; charset=utf-8', TRUE);

/*
*/
$arrayOptions = array('socket' => array('bindto' => '0:0'));
$options = stream_context_create($arrayOptions);
$socket = stream_socket_client('tcp://smtp.mail.yahoo.com.br:25', $errno, $errstr, 1, STREAM_CLIENT_CONNECT, $options);
stream_set_blocking($socket, 1);
stream_set_timeout($socket, 0, 400000);
$eof = (boolean) FALSE;

while($eof !== TRUE) {
    $response = fread($socket, 8);
    echo($response);
    flush();
    if($response === '') { $eof = (boolean) TRUE; }
}
var_dump(feof($socket));
fwrite($socket, 'EHLO' . "\r\n");
$eof = (boolean) FALSE;

while($eof !== TRUE) {
    $response = fread($socket, 8);
    echo($response);
    flush();
    if($response === '') { $eof = (boolean) TRUE; }
}
var_dump(feof($socket));

fclose($socket);

?>