Ok to nie działa... jak do aplikacji ISAPI - $send_mail przesłać zmienne - $snd_cmd używając metody POST????
<?
function SMail($do, $temat, $tresc, $nag = '') {

$host = "www.serwer.pl";
$send_mail = "/mail/sendmail.dll";

$mail_host = "smtp.serwer.pl";
$mail_user = "user";
$mail_pass = "pass";

$snd_cmd = "?host=".$mail_host."&";
$snd_cmd .= "user=".$mail_user."&";
$snd_cmd .= "pass=".$mail_pass."&";
$snd_cmd .= "to=".$do."&";
$snd_cmd .= "subject=".$temat."&";
$snd_cmd .= "body=".$tresc."&";
$snd_cmd .= "headers=".$nag;

function httpPost($host, $path, $referer, $data) {
    $fp = fsockopen($host, 80);
    fputs($fp, "POST ".$path." HTTP/1.0\r\n");
    fputs($fp, "Host: ".$host."\r\n");
    fputs($fp, "Referer: ".$referer."\r\n");
    fputs($fp, "Content-type: application/x-www-url-encoded\r\n");
    fputs($fp, "Content-length: ".strlen($data)."\r\n");
    fputs($fp, "\r\n");
    fputs($fp, $data."\r\n");
    fputs($fp, "\r\n");

    $tmp_headers = "";
     while ($str = trim(fgets($fp, 4096)))
        $tmp_headers .= $str."\n";

    $tmp_body = "";
    while (!feof($fp))
         $tmp_body .= fgets($fp, 4096);

    fclose($fp);
    return $tmp_body;
}

echo httpPost($host, $send_mail, $host, $snd_cmd);

}

SMail("[email protected]", "Test", "Tresc");
?>