PHP - email desde localhost

<?php session_start();

function mail_attachment($filename, $path, $mailto, $from_mail, $from_name, $replyto, $subject, $message) {

    $file = $path.$filename;

    $file_size = filesize($file);

    $handle = fopen($file, "r");

    $content = fread($handle, $file_size);

    fclose($handle);

    $content = chunk_split(base64_encode($content));

    $uid = md5(uniqid(time()));

    $name = basename($file);

    $header = "From: ".$from_name." <".$from_mail.">\r\n";

    $header .= "Reply-To: ".$replyto."\r\n";

    $header .= "MIME-Version: 1.0\r\n";

    $header .= "Content-Type: multipart/mixed; boundary=\"".$uid."\"\r\n\r\n";

    $header .= "This is a multi-part message in MIME format.\r\n";

    $header .= "--".$uid."\r\n";

    $header .= "Content-type:text/plain; charset=iso-8859-1\r\n";

    $header .= "Content-Transfer-Encoding: 7bit\r\n\r\n";

    $header .= $message."\r\n\r\n";

    $header .= "--".$uid."\r\n";

    $header .= "Content-Type: application/octet-stream; name=\"".$filename."\"\r\n"; // use different content types here

    $header .= "Content-Transfer-Encoding: base64\r\n";

    $header .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";

    $header .= $content."\r\n\r\n";

    $header .= "--".$uid."--";

    if (mail($mailto, $subject, "", $header)) {

        echo "mail send ... OK"; exit;// or use booleans here

    } else {

        echo "mail send ... ERROR!";exit;

    }

}

$my_file = "serial.txt"; // puede ser cualquier formato

$my_path = $_SERVER['DOCUMENT_ROOT']."/rips para enviar/";

$my_name = $_SESSION['usuario'];

$my_mail = "gerencia@anamnesis.com.co";

$my_replyto = "gerencia@anamnesis.com.co";

$my_subject = "Le adjuntamos mis RIPS";

$my_message = "Tu mensaje..<br>este es el espacio....<br><br>para el mensaje";

mail_attachment($my_file, $my_path, "casilla_destinatario@dominio.com", $my_mail, $my_name, $my_replyto, $my_subject, $my_message);

?>

Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in E:\root\Pacientes\enviar email.php on line 28

mail send ... ERROR!

[mail function]

; For Win32 only.

; http://php.net/smtp

SMTP = localhost

; http://php.net/smtp-port

smtp_port = 25

[mail function]

; For Win32 only.

; http://php.net/smtp

SMTP = 127.0.0.1

; http://php.net/smtp-port

smtp_port = 25