scusate la lunghezza dello script ma e' necessario per farvi capire il problema....

ho queto script per l'invio di dati tuttavia se nel form se scrivo l'email tutto ok se non la scrivo parte lo stesso se la scrivo male si blocca avvisandomi di inserirne una valida......

questo direi che non ha molto senso... come posso correggere in modo che si blocchi anche se non si mette l'email??
che cosa vuol dire quel file badip.txt?
che senso ha $email = '';?

grazie


purtroppo devo dividere in due lo script
Codice PHP:
<?php


/***************************************
** Security.
***************************************/
        $security      = 0;
        $servername[]  = 'www.miosito.com';
        $servername[]  = 'www.miosito.com';
        $bad_addresses = 'badip.txt';
        $check_email   = 1;

/***************************************
** Templates.
***************************************/
        $use_templates = 1;
        $tpl_thankyou  = 'thankyou.html';
        $tpl_email     = 'email.template.txt';

/***************************************
** Non-template redirections.
***************************************/
        $required_error = 'error.required.html';
        $bad_referer    = 'error.referer.html';
        $bad_address    = 'error.address.html';
        $invalid_email  = 'error.email.html';
        $thankyou_page  = 'thankyou.html';
    
/***************************************
** Some defaults.
***************************************/
        $email     = '';
        $recipient = 'miamail@miosito.com';
        $subject   = 'Form';
        $addhostip = 0;




########################################
# Nothing to change below here.        #
########################################



        class html_mime_mail{

                var $headers;
                var $body;
                var $multipart;
                var $mime;
                var $parts = array();

                function html_mime_mail($headers = ''){
                        $this->headers = $headers;
                }

                function add_attachment($file, $name = '', $c_type = 'application/octet-stream'){
                        $this->parts[] = array( 'body'   => $file,
                                                'name'   => $name,
                                                'c_type' => $c_type );
                }

                function add_body_text($body){
                        $this->body = $body;
                }

                function build_body(){
                        $body  = 'Content-Type: text/html'."\n";
                        $body .= 'Content-Transfer-Encoding: base64'."\n\n";
                        $body .= chunk_split(base64_encode($this->body))."\n";
                        return $body;
                }

                function build_part($i){
                        $message_part = '';
                        $message_part.= 'Content-Type: '.$this->parts[$i]['c_type'];
                        if($this->parts[$i]['name'] != '')
                                $message_part .= '; name="'.$this->parts[$i]['name']."\"\n";
                        else
                                $message_part .= "\n";

                        $message_part.= 'Content-Transfer-Encoding: base64'."\n";
                        $message_part.= 'Content-Disposition: attachment; filename="'.$this->parts[$i]['name']."\"\n\n";
                        $message_part.= chunk_split(base64_encode($this->parts[$i]['body']))."\n";
                        return $message_part;
                }

                function build_message(){
                        $boundary = '=_'.md5(uniqid(time()));

                        $this->headers.= "MIME-Version: 1.0\n";
                        $this->headers.= "Content-Type: multipart/mixed;".chr(10).chr(9)."boundary=\"".$boundary."\"\n";
                        $this->multipart = '';
                        $this->multipart.= "This is a MIME encoded message.\nCreated by html_mime_mail.class.\nSee [url]http://www.miosito.com/[/url] for a copy.\n\n";

                        $this->multipart .= '--'.$boundary."\n".$this->build_body();

                        for($i=(count($this->parts)-1); $i>=0; $i--){
                                $this->multipart.= '--'.$boundary."\n".$this->build_part($i);
                        }

                        $this->mime = $this->multipart."--".$boundary."--\n";
                }

                function send($to_name, $to_addr, $from_name, $from_addr, $subject = '', $headers = ''){

                        if($to_name != '') $to = '"'.$to_name.'" <'.$to_addr.'>';
                        else $to = $to_addr;

                        if($from_name != '') $from = '"'.$from_name.'" <'.$from_addr.'>';
                        else $from = $from_addr;

                        mail($to, $subject, $this->mime, 'From: '.$from."\n".$this->headers);
                }

        } // End of class.




        class template{

                var $var_names = array();
                var $files = array();
                var $start = '{';
                var $end = '}';

                function load_file($file_id, $filename){
                        $this->files[$file_id] = fread($fp = fopen($filename, 'r'), filesize($filename));
                        fclose($fp);
                }

                function set_identifiers($start, $end){
                        $this->start = $start;
                        $this->end = $end;
                }

                function register($file_id, $var_name){
                        if(is_long(strpos($var_name, ',')) == TRUE){
                                $var_name = explode(',', $var_name);
                                for(reset($var_name); $current = current($var_name); next($var_name)) $this->var_names[$file_id][] = $current;
                        }else{
                                $this->var_names[$file_id][] = $var_name;
                        }
                }

                function parse($file_id){
                        if(isset($this->var_names[$file_id]) AND count($this->var_names[$file_id]) > 0){
                                for($i=0; $i<count($this->var_names[$file_id]); $i++){
                                        $temp_var = $this->var_names[$file_id][$i];
                                        global $$temp_var;
                                        $this->files[$file_id] = str_replace($this->start.$temp_var.$this->end, $$temp_var, $this->files[$file_id]);
                                }
                        }
                }

                function parse_loop($file_id, $array_name){
                        global $$array_name;
                        $loop_code = '';
                        $file = explode(chr(10), $this->files[$file_id]);

                        $start_pos = strpos(strtolower($this->files[$file_id]), '<loop name="'.$array_name.'">') + strlen('<loop name="'.$array_name.'">');
                        $end_pos = strpos(strtolower($this->files[$file_id]), '</loop name="'.$array_name.'">');

                        $loop_code = substr($this->files[$file_id], $start_pos, $end_pos-$start_pos);
                        $this->files[$file_id] = str_replace(substr($this->files[$file_id], strpos(strtolower($this->files[$file_id]), '<loop name="'.$array_name.'">'),strlen('<loop name="'.$array_name.'">')), '', $this->files[$file_id]);
                        $this->files[$file_id] = str_replace(substr($this->files[$file_id], strpos(strtolower($this->files[$file_id]), '</loop name="'.$array_name.'">'),strlen('</loop name="'.$array_name.'">')), '', $this->files[$file_id]);

                        if($loop_code != ''){
                                $new_code = '';
                                for($i=0; $i<count($$array_name); $i++){
                                        $temp_code = $loop_code;
                                        while(list($key,) = each(${$array_name}[$i])){
                                                $temp_code = str_replace($this->start.$key.$this->end,${$array_name}[$i][$key], $temp_code);
                                        }
                                        $new_code .= $temp_code;
                                }
                                $this->files[$file_id] = str_replace($loop_code, $new_code, $this->files[$file_id]);
                        }
                }

                function parse_sql($file_id, $result_name){
                        global $$result_name;
                        $loop_code = '';

                        $start_pos = strpos(strtolower($this->files[$file_id]), '<loop name="'.$result_name.'">') + strlen('<loop name="'.$result_name.'">');
                        $end_pos = strpos(strtolower($this->files[$file_id]), '</loop name="'.$result_name.'">');

                        $loop_code = substr($this->files[$file_id], $start_pos, $end_pos-$start_pos);
                        $this->files[$file_id] = str_replace(substr($this->files[$file_id], strpos(strtolower($this->files[$file_id]), '<loop name="'.$result_name.'">'),strlen('<loop name="'.$result_name.'">')), '', $this->files[$file_id]);
                        $this->files[$file_id] = str_replace(substr($this->files[$file_id], strpos(strtolower($this->files[$file_id]), '</loop name="'.$result_name.'">'),strlen('</loop name="'.$result_name.'">')), '', $this->files[$file_id]);

                        if($loop_code != ''){
                                $new_code = '';
                                $field_names = array();
                                for($i=0; $i<mysql_num_fields($$result_name); $i++) $field_names[] = mysql_field_name($$result_name,$i);
                                while($row_data = mysql_fetch_array($$result_name, MYSQL_ASSOC)){
                                        $temp_code = $loop_code;
                                        for($i=0; $i<count($field_names); $i++){
                                                $temp_code = str_replace($this->start.$field_names[$i].$this->end, $row_data[$field_names[$i]], $temp_code);
                                        }
                                        $new_code.= $temp_code;
                                }
                                $this->files[$file_id] = str_replace($loop_code, $new_code, $this->files[$file_id]);
                        }
                }

                function print_file($file_id){
                        if(is_long(strpos($file_id, ',')) == TRUE){
                                $file_id = explode(',', $file_id);
                                for(reset($file_id); $current = current($file_id); next($file_id)) echo $this->files[$current];
                        }else{
                                echo $this->files[$file_id];
                        }
                }

                function return_file($file_id){
                        $ret = '';
                        if(is_long(strpos($file_id, ',')) == TRUE){
                                $file_id = explode(',', $file_id);
                                for(reset($file_id); $current = current($file_id); next($file_id)) $ret .= $this->files[$current];
                        }else{
                                $ret .= $this->files[$file_id];
                        }
                        return $ret;
                }

        } // End of class