function pop_list ($msgNum = "") {
        //  If called with an argument, returns that msgs' size in octets
        //  No argument returns an associative array of undeleted
        //  msg numbers and their sizes in octets

        if(!isset($this->FP))
        {
            $this->ERROR = "POP3 pop_list: " . _("No connection to server");
            return false;
        }
        $fp = $this->FP;
        $Total = $this->COUNT;
        if( (!$Total) or ($Total == -1) )
        {
            return false;
        }
        if($Total == 0)
        {
            return array("0","0");
            // return -1;   // mailbox empty
        }

        $this->update_timer();

        if(!empty($msgNum))
        {
            $cmd = "LIST $msgNum";
            fwrite($fp,"$cmd\r\n");
            $reply = fgets($fp,$this->BUFFER);
            $reply = $this->strip_clf($reply);
            if($this->DEBUG) {
                @error_log("POP3 SEND [$cmd] GOT [$reply]",0);
            }
            if(!$this->is_ok($reply))
            {
                $this->ERROR = "POP3 pop_list: " . _("Error ") . "[$reply]";
                return false;
            }
            list($junk,$num,$size) = preg_split('/\s+/',$reply);
            return $size;
        }
        $cmd = "LIST";
        $reply = $this->send_cmd($cmd);
        if(!$this->is_ok($reply))
        {
            $reply = $this->strip_clf($reply);
            $this->ERROR = "POP3 pop_list: " . _("Error ") .  "[$reply]";
            return false;
        }
        $MsgArray = array();
        $MsgArray[0] = $Total;
        for($msgC=1;$msgC <= $Total; $msgC++)
        {
            if($msgC > $Total) { break; }
            $line = fgets($fp,$this->BUFFER);
            $line = $this->strip_clf($line);
            if(strpos($line, '.') === 0)
            {
                $this->ERROR = "POP3 pop_list: " . _("Premature end of list");
                return false;
            }
            list($thisMsg,$msgSize) = preg_split('/\s+/',$line);
            settype($thisMsg,"integer");
            if($thisMsg != $msgC)
            {
                $MsgArray[$msgC] = "deleted";
            }
            else
            {
                $MsgArray[$msgC] = $msgSize;
            }
        }
        return $MsgArray;
    }