fsocketopen til smtp med authentication?

Hej, jeg har fundet nedenstående kode i et tidligere spm her på sitet.. jeg skal bruge noget lignende, min smtp server kræver bare email og kode for at logge på serveren...

er der nogen der kan fortælle mig hvordan jeg fletter det ind i scriptet?

<?php
class smtp_client {
    var $connection;
    var $server;
    var $elog_fp;
    var $log_file='./smtp_client.log';
    var $do_log=true;


    // default constructor
    function smtp_client($server='smtp.server.dk') { //din udbyders smtp server
        if (!$server) $this->server="localhost";
        else $this->server=$server;
       
        $this->connection = fsockopen($this->server, 25);
        if ($this->connection <= 0) return 0;

        $this->elog(fgets($this->connection, 1024));
        $this->elog("HELO xyz\r\n", 1);
        fputs($this->connection,"HELO xyz\r\n");
        $this->elog(fgets($this->connection, 1024));
        }

    function email($from_mail, $to_mail, $to_name, $header, $subject, $body) {
        if ($this->connection <= 0) return 0;

        $this->elog("MAIL FROM:$from_mail", 1);
        fputs($this->connection,"MAIL FROM:$from_mail\r\n");
        $this->elog(fgets($this->connection, 1024));

        $this->elog("RCPT TO:$to_mail", 1);
        fputs($this->connection, "RCPT TO:$to_mail\r\n");
        $this->elog(fgets($this->connection, 1024));

        $this->elog("DATA", 1);
        fputs($this->connection, "DATA\r\n");
        $this->elog(fgets($this->connection, 1024));

        $this->elog("Subject: $subject", 1);
        $this->elog("To: $to_name", 1);
        fputs($this->connection,"Subject: $subject\r\n");
        fputs($this->connection,"To: $to_name\r\n");

        if ($header) {
            $this->elog($header, 1);
            fputs($this->connection, "$header\r\n");
            }

        $this->elog("", 1);
        $this->elog($body, 1);
        $this->elog(".", 1);
        fputs($this->connection,"\r\n");
        fputs($this->connection,"$body \r\n");
        fputs($this->connection,".\r\n");
        $this->elog(fgets($this->connection, 1024));

        return 1;
        }


    function send() {
        if ($this->connection) {
            fputs($this->connection, "QUIT\r\n");
            fclose($this->connection);
            $this->connection=0;
            }
        }

    function close() { $this->send(); }


    function elog($text, $mode=0) {
        if (!$this->do_log) return;

        // open file
        if (!$this->elog_fp) {
            if (!($this->elog_fp=fopen($this->log_file, 'a'))) return;
            fwrite($this->elog_fp, "\n-------------------------------------------\n");
            fwrite($this->elog_fp, " Sent " . date("Y-m-d H:i:s") . "\n");
            fwrite($this->elog_fp, "-------------------------------------------\n");
            }

        // write to log
        if (!$mode) fwrite($this->elog_fp, "    $text\n");
        else fwrite($this->elog_fp, "$text\n");
        }
    }

mysql_connect("mysql.server.dk", "bruger" ,"*******") or die (mysql_error());
mysql_select_db("database") or die (mysql_error());

$res = mysql_query("select to_mail, to_name from mailliste") or die (mysql_error());

$from = "mail@server.dk"; //din egen mail :-)
$header = "Content-type: text/plain; charset=ISO-8859-1";
$subject = "Test af fsockopen()";
$body = "Dette er en test";

$smtp = new smtp_client;
$smtp -> smtp_client();

while (list($to_mail, $to_name) = mysql_fetch_row($res)) {
  $smtp->email("$from", "$to_mail", "$to_name", "$header", "$subject", "$body");
  }

$smtp->send();
mysql_close();
?>