Send mail via SMTP using PHP

I am trying to send a mail via SMTP using PHP. The coding as below:


 // initialization setting
 $mailserver="";//smtp mail server;
 $sender=""; //sender address, example: test@fedex.com;
 $pass=""; //sender mailbox password that is for authenticate user.
 $from= ""; //for mail body content same as sender.
 $to1=""; //for receive address.
 $subject=""; //mail subject;
 
 $employeename=$_POST['employeename'];//employee name;
 $employeeid=$_POST['employeeid']; // employee id
 
 $fp = @fsockopen($mailserver,25,$errno,$errstr,15);
 if ($fp){
  $instr= fgets($fp,512);
  if (substr($instr,0,3)!="220"){
            echo "resp=1&reason=1.".$instr;
            exit();
  }

 


  $outstr="EHLO Me\r\n";
  fputs($fp,$outstr);
  //echo $outstr;
   
  $instr= fread($fp,2048);
  ////echo  $instr;
 
      if (substr($instr,0,3)!="250"){
            echo "resp=1&reason=2.".$instr;
            exit();
      }

 
  $outstr="AUTH LOGIN\r\n";
  fputs($fp,$outstr);
  //echo $outstr;
 
  $instr= fgets($fp,512);
  //echo  $instr;
 
  if (substr($instr,0,3)!="334"){
            echo "resp=1&reason=3.".$instr;
            exit();
  }
 
   
  $outstr=base64_encode($sender)."\r\n";
  fputs($fp,$outstr);
  //echo $outstr;
 
  $instr= fgets($fp,512);
  //echo  $instr;
 
  if (substr($instr,0,3)!="334"){
            echo "resp=1&reason=4.".$instr;
            exit();
  }

 
  $outstr= base64_encode($pass)."\r\n";
  fputs($fp,$outstr);
  //echo $outstr;
 
  $instr= fgets($fp,512);
  //echo  $instr;
 
  if (substr($instr,0,3)!="235"){
            echo "resp=1&reason=5.".$instr;
            exit();
  }  
 
  $outstr="MAIL FROM:<".$sender.">\r\n";
  fputs($fp,$outstr);
  //echo $outstr;
 
  $instr= fgets($fp,512);
  //echo  $instr;
 
  if (substr($instr,0,3)!="250"){
            echo "resp=1&reason=6.".$instr;
            exit();
  }

 
  $outstr="RCPT TO:<".$to1.">\r\n";
  fputs($fp,$outstr);
  //echo $outstr;
 
  $instr= fgets($fp,512);
  //echo  $instr;
 
  if (substr($instr,0,3)!="250"){
            echo "resp=1&reason=7.".$instr;
            exit();
  }

 /* $outstr="RCPT TO:<".$to2.">\r\n";
  fputs($fp,$outstr);
 
  $instr= fgets($fp,512);
  if (substr($instr,0,3)!="250"){
            echo "resp=1&reason=".$instr;
            exit();
  }*/
 
  $outstr="DATA\r\n";
  fputs($fp,$outstr);
  //echo $outstr;
 
  $instr= fgets($fp,512);
  //echo  $instr;
 
  if (substr($instr,0,3)!="354"){
            echo "resp=1&reason=8.".$instr;
            exit();
  }

 
  $data="Date: ".date("r",time())."\r\n";
  $data.="To: ".$to."\r\n";
  $data.="From: ".$from."\r\n";
  $data.="Reply-to: ".$sender."\r\n";
  $data.="Subject:".$subject."\r\n";
  $data.="X-Priority: 3\r\n";
  $data.="X-Mailer: phpmailer [version 1.54]\r\n";
  $data.="Return-Path: ".$sender."\r\n";
  $data.="MIME-Version: 1.0\r\n";
  $data.="Content-Transfer-Encoding: 8bit\r\n";
  $data.="Content-Type: text/plain; charset = \"utf-8\"\r\n";
  $data.="\r\n";
  $data.="
Employee name: $employeename
Employee ID: $employeeid";

  $outstr=$data."\r\n.\r\n";
  fputs($fp,$outstr);
 
  $instr= fgets($fp,512);
  //echo  $instr;
  if (substr($instr,0,3)!="250"){
            echo "resp=1&reason=9.".$instr;
            exit();
  }
 
  $outstr="QUIT\r\n";
  fputs($fp,$outstr);
  //echo $outstr;

  fclose($fp);
 
  //====
//  echo "Congratulation! TEST Mail is sent success!<br />\r\n<br />\r\n==========mail body below==============<br />\r\n"."mail from:".$from."<br />\r\nrcpt to:".$to."<br />\r\ndata:".$data."<br />\r\n=====================================";//remove this line while seccess;
  //====
  //====
  echo "resp=0";
 
 }else{
       echo "resp=1&reason=mail connect error";
 }
 
Everytime I tried out, it gives me the error "mail connect error". Any kind experts out there, please help.

*I have my own web server, running windows server 2003. Its running on IIS, with PHP and Perl supported.