imap-Funktionen von PHP: Wie wirklichen Empfänger finden?

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$headers = imap_header($mbox,$i);
echo $headers->to[0]->mailbox.", ";
echo $headers->to&#91;0&#93;->host."<br />\n";

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/* Verbindung zum Server herstellen */
  function connect($host,$port,$boxname,$password)
  {
    return imap_open("\{$host/pop3:$port}INBOX",$boxname,$password);
  }
  
  /* Verbindung trennen */
  function disconnect($handle)
  {
    imap_close($handle);
  }

  /* prüft ob UTF8-Dekodierung erfolderlich ist */
  function decodeHeaderField($text2decode)
  {
    if(strpos($text2decode,'?iso-8859-1?Q?') != false)
    {
      return utf8_decode(imap_utf8($text2decode));
    }
    else
    {
      return $text2decode;
    }
  }

  /* Dekodierte den als String übergebenen kodierten Text aus dem in $encoding angegebenen Format */
  /* Soll der 76-Zeichen-Break nicht berücksichtigt werden, muss $convert76 false sein */
  /* Sollen unnötige Whitespaces entfernt werden, dann $trimText = true */
  function decode($text2decode,$encoding,$convert76 = true,$trimText = true)
  {
    /* Whitespaces entfernen */
    if($trimText)
    {
      $text2decode = trim($text2decode);
    }
    /* 76-Zeichen-Break */
    if($convert76)
    {
      $text2decode = str_replace("=\r\n","\n",$text2decode);
    }
    else
    {
      $text2decode = str_replace("=\r\n",'',$text2decode);
    }
    /* Dekodieren */
    switch($encoding)
    {
      case 0:
        return quoted_printable_decode($text2decode);
        break;
      case 1:
        return $text2decode;
        break;
      case 2:
        return imap_base64(imap_binary($text2decode));
        break;
      case 3:
        return imap_base64($text2decode);
        break;
      case 4:
        return quoted_printable_decode($text2decode);
        break;
      default:
      case 5:
        return $text2decode;
        break;
    }
  }

$con = connect($_SESSION['host'],$_SESSION['port'],$_SESSION['boxname'],$_SESSION['password']);
    if($con)
    {
      $headerinfo = imap_headerinfo($con,$msgno);
      $structure = imap_fetchstructure($con,$msgno);
      $subject = decodeHeaderField($headerinfo->subject);
      $from = @decodeHeaderField($headerinfo->from[0]->personal);
      $fromemail = $headerinfo->from[0]->mailbox.'@'.$headerinfo->from[0]->host;
      echo '<h1>Test Mail</h1>';
      echo '<h3>'.$subject.'</h3>';
      echo '<p><b>'.$from.'</b> <'.$fromemail.'></h4>';
      echo '<p><a href="index.php">Übersicht</a></p>';
      echo '<pre>'.decode&#40;imap_fetchbody&#40;$con,$msgno,1&#41;,$structure->encoding,false&#41;.'</pre>';
      disconnect&#40;$con&#41;;
    &#125;