public function postmessage($data, $form)
 {
     $signature = PostmarkSignature::get()->byID($data['FromID']);
     PostmarkMailer::RecordEmails(true);
     PostmarkMailer::ReplyToMessageID($data['InReplyToID']);
     $clients = PostmarkHelper::client_list()->filter('ID', $data['ToMemberID']);
     foreach ($clients as $client) {
         $email = new Email($signature->Email, $client->Email, $data['Subject'], PostmarkHelper::MergeEmailText($data['Body'], $client));
         for ($i = 1; $i <= 5; $i += 1) {
             $strKey = 'Attachment_' . $i;
             if (isset($_FILES[$strKey]) && $_FILES[$strKey]['tmp_name']) {
                 $contents = file_get_contents($_FILES[$strKey]['tmp_name']);
                 if (strlen($contents)) {
                     $email->attachFileFromString($contents, $_FILES[$strKey]['name']);
                 }
             }
         }
         $this->extend('updatePostmessage', $email, $data);
         $email->setTemplate('NewsletterTemplate');
         $email->send();
     }
     PostmarkMailer::RecordEmails(false);
     PostmarkMailer::ReplyToMessageID(0);
 }