Probleme bei einem Hook

/**
         * Send the form
         *
         * The send method tries to send the form. It builds the necessary email and submits it via wp_mail
         */
        function send()
        {    
            $new_post = array();
            foreach ($_POST as $key => $post)
            {
                $new_post[str_replace('avia_','',$key)] = $post;
            }


            $mymail     = empty($this->form_params['myemail']) ? $new_post['myemail'] : $this->form_params['myemail'];
            $myblogname = empty($this->form_params['myblogname']) ? $new_post['myblogname'] : $this->form_params['myblogname'];


            if(empty($new_post['subject_'.$this->formID]) && !empty($this->form_params['subject'])) $new_post['subject_'.$this->formID] = $this->form_params['subject'];
            $subject     = empty($new_post['subject_'.$this->formID]) ? __("New Message", 'avia_framework') . " (".__('sent by contact form at','avia_framework')." ".$myblogname.")"  : $new_post['subject_'.$this->formID];


            $default_from = parse_url(home_url());
            
            //hook to stop execution here and do something different with the data
            $proceed = apply_filters('avf_form_send', true, $new_post, $this->form_params);


            if(!$proceed) return true;


            //set the email adress
            $from = "no-reply@wp-message.com";
            $usermail = false;


            if(!empty($default_from['host'])) $from = "no-reply@".$default_from['host'];


            if(!empty($this->autoresponder[0]))
            {
                $from = $_POST[$this->autoresponder[0]];
                $usermail = true;
            }
            else
            {
                $email_variations = array( 'e-mail', 'email', 'mail' );


                foreach($email_variations as $key)
                {
                    foreach ($new_post as $current_key => $current_post)
                    {
                        if( strpos($current_key, $key) !== false)
                        {
                            $from = $new_post[$current_key];
                            $usermail = true;
                            break;
                        }


                    }


                    if($usermail == true) break;
                }
            }
            
            
            $to = urldecode( $mymail );
            
            $delimiter = ",";
            if(strpos($to, ',') === false && strpos($to, ' ') !== false) $delimiter = " ";
            
            $to = array_filter(array_map('trim', explode($delimiter, $to)));
            $to = apply_filters("avf_form_sendto", $to, $new_post, $this->form_params);
    
            $from = urldecode( $from );
            $from = apply_filters("avf_form_from", $from, $new_post, $this->form_params);


            $subject = urldecode( $subject );
            $subject = apply_filters("avf_form_subject", $subject, $new_post, $this->form_params);


            $message = "";
            $iterations = 0;


            foreach($this->form_elements as $key => $element)
            {
                $key = avia_backend_safe_string($key, '_', true);


                if(empty($key))
                {
                    $iterations++;
                    $key = $iterations;
                }


                // substract 5 characters from the string length because we removed the avia_ prefix with 5 characters at the beginning of the send() function 
                $key = avia_backend_truncate($key, $this->length - 5, "_", "", false, '', false);


                $key .= $this->id_sufix;


                if(!empty($new_post[$key]))
                {
                    if($element['type'] != 'hidden' && $element['type'] != 'decoy')
                    {
                        if($element['type'] == 'textarea') $message .= " <br/>";
                        $field_value = apply_filters("avf_form_mail_field_values", nl2br(urldecode($new_post[$key])), $new_post, $this->form_elements, $this->form_params);
                        $message .= $element['label'].": ".$field_value." <br/>";
                        if($element['type'] == 'textarea') $message .= " <br/>";
                    }
                }
            }




            $use_wpmail = apply_filters("avf_form_use_wpmail", true, $new_post, $this->form_params);


            //$header  = 'MIME-Version: 1.0' . "\r\n";
            $header = 'Content-type: text/html; charset=utf-8' . "\r\n";
            $header = apply_filters("avf_form_mail_header", $header, $new_post, $this->form_params);
            $copy     = apply_filters("avf_form_copy", $to, $new_post, $this->form_params);
            
            $message = stripslashes($message);
            
            foreach($copy as $send_to_mail)
            {
                if($use_wpmail)
                {
                    $header .= 'From: '. $from . " <".$from."> \r\n";
                    wp_mail($send_to_mail, $subject, $message, $header);
                }
                else
                {
                    $header .= 'From:'. $from . " \r\n";
                    mail($send_to_mail, $subject, $message, $header);
                }
            }


            //autoresponder?
            if($usermail && !empty($this->form_params['autoresponder']))
            {
                //$header  = 'MIME-Version: 1.0' . "\r\n";
                $header = 'Content-type: text/html; charset=utf-8' . "\r\n";
                $header = apply_filters("avf_form_mail_header", $header, $new_post, $this->form_params);




                $message = nl2br($this->form_params['autoresponder'])."<br/><br/><br/><strong>".__('Your Message:','avia_framework')." </strong><br/><br/>".$message;
                $message = apply_filters("avf_form_autorespondermessage", $message);


                $from = apply_filters("avf_form_autoresponder_from", $from, $new_post, $this->form_params);


                if($use_wpmail)
                {
                    $header .= 'From:' . get_bloginfo('name') .' <'. urldecode( $this->form_params['autoresponder_email']) . "> \r\n";
                    wp_mail($from, $this->form_params['autoresponder_subject'], $message, $header);
                }
                else
                {
                    $header .= 'From:'. urldecode( $this->form_params['autoresponder_email']) . " \r\n";
                    mail($from, $this->form_params['autoresponder_subject'], $message, $header);
                }
            }
            unset($_POST);
            return true;
            //return wp_mail( $to, $subject, $message , $header);




        }