Simple C(ontact) Plugin (fork of p01-contact)

[0zz]

After surfing a while I found several solutions to send messages via smtp function. However, due to poor PHP skills i cannot use this function in this plugin. Can someone help?
Here I am attaching function for smtp:

Code:

<?php
  $config['smtp_username'] = 'my@mail.com';  // put your email
  $config['smtp_port']   = '25'; // usually
  $config['smtp_host']   = 'smtp.mail.com';  //or could be ssl://smtp.mail.com
  $config['smtp_password'] = 'pass';  //mail password
  $config['smtp_debug'] = true;  //show mistakes
  $config['smtp_charset']  = 'UTF-8';  //encoding
  $config['smtp_from']   = 'Mister Nobody'; //Your name
function smtpmail($mail_to, $subject, $message, $headers='') {
  global $config;
  $SEND = "Date: ".date("D, d M Y H:i:s") . " UT\r\n";
  $SEND .=  'Subject: =?'.$config['smtp_charset'].'?B?'.base64_encode($subject)."=?=\r\n";
  if ($headers) $SEND .= $headers."\r\n\r\n";
  else
  {
      $SEND .= "Reply-To: ".$config['smtp_username']."\r\n";
      $SEND .= "MIME-Version: 1.0\r\n";
      $SEND .= "Content-Type: text/plain; charset=\"".$config['smtp_charset']."\"\r\n";
      $SEND .= "Content-Transfer-Encoding: 8bit\r\n";
      $SEND .= "From: \"".$config['smtp_from']."\" <".$config['smtp_username'].">\r\n";
      $SEND .= "To: $mail_to <$mail_to>\r\n";
      $SEND .= "X-Priority: 3\r\n\r\n";
  }
  $SEND .=  $message."\r\n";
   if( !$socket = fsockopen($config['smtp_host'], $config['smtp_port'], $errno, $errstr, 30) ) {
    if ($config['smtp_debug']) echo $errno."<br>".$errstr;
    return false;
   }

  if (!server_parse($socket, "220", __LINE__)) return false;

  fputs($socket, "HELO " . $config['smtp_host'] . "\r\n");
  if (!server_parse($socket, "250", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>cannot send HELO!</p>';
    fclose($socket);
    return false;
  }
  fputs($socket, "AUTH LOGIN\r\n");
  if (!server_parse($socket, "334", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>cannot find request for authorization.</p>';
    fclose($socket);
    return false;
  }
  fputs($socket, base64_encode($config['smtp_username']) . "\r\n");
  if (!server_parse($socket, "334", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>Login is not correct</p>';
    fclose($socket);
    return false;
  }
  fputs($socket, base64_encode($config['smtp_password']) . "\r\n");
  if (!server_parse($socket, "235", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>PAssword was not accepted</p>';
    fclose($socket);
    return false;
  }
  fputs($socket, "MAIL FROM: <".$config['smtp_username'].">\r\n");
  if (!server_parse($socket, "250", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>Cannot use command MAIL FROM: </p>';
    fclose($socket);
    return false;
  }
  fputs($socket, "RCPT TO: <" . $mail_to . ">\r\n");

  if (!server_parse($socket, "250", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>Cannot use command RCPT TO: </p>';
    fclose($socket);
    return false;
  }
  fputs($socket, "DATA\r\n");

  if (!server_parse($socket, "354", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>Cannot use command DATA</p>';
    fclose($socket);
    return false;
  }
  fputs($socket, $SEND."\r\n.\r\n");

  if (!server_parse($socket, "250", __LINE__)) {
    if ($config['smtp_debug']) echo '<p>The message body was not sent!</p>';
    fclose($socket);
    return false;
  }
  fputs($socket, "QUIT\r\n");
  fclose($socket);
  return TRUE;
}

function server_parse($socket, $response, $line = __LINE__) {
  global $config;
  while (@substr($server_response, 3, 1) != ' ') {
    if (!($server_response = fgets($socket, 256))) {
      if ($config['smtp_debug']) echo "<p>Problems!</p>$response<br>$line<br>";
      return false;
    }
  }
  if (!(substr($server_response, 0, 3) == $response)) {
    if ($config['smtp_debug']) echo "<p>Problems!</p>$response<br>$line<br>";
    return false;
  }
  return true;
}
?>

this code should be saved and called instead of mail() function.. But how? (