защитить форму bxsender от спам подписок

{'!AjaxForm' | snippet:[
            'snippet' =>'custRegister'
            'form' =>'@FILE chunks/forms/regForm.html'
            'activationEmailTpl' =>'custActivateEmailTpl'
            'activationResourceId' => '30'
            'activationEmailSubject' =>'Подтверждение регистрации'
            'usergroups' =>'1'
            'usernameField' =>'email'
            'passwordField' =>'password'
            'validate'=>'nospam:blank,
            password:required:minLength=^8^,
            password_confirm:password_confirm=^password^,
            fullname:required:minLength=^2^,
            acceptRules2:required,
            usergroups:required,
            email:required:email',
            'placeholderPrefix' =>'reg.'
            ]}

<?php
$scriptProperties = array_merge($scriptProperties, $_POST); // вот тут FormIt проверяет поля
$result = $modx->runSnippet('Register', $scriptProperties);

foreach($modx->placeholders as $key => $ph){
    if(strpos($key, $scriptProperties[placeholderPrefix].'error.') === 0){
        $placeholders[$key] = $ph;
    } 
}

if(count($placeholders)){
    return $AjaxForm->error('В форме содержатся ошибки', array('error' => $placeholders));
} else {
    switch($_POST['usergroup']){
        
        // franchisee
        case '3':
            $listId = '106';
            break;
        
         // franchiser    
        case '2':
            $listId = '107';
            $extended['dontshowonmain'] = 1;
            $extended['nonews'] = 1;
            break;  
        
         // other    
        case '1':
            $listId = '1';
            break;              
    }
    $user = $modx->getObject('modUser', array('username' => $_POST['email']));

    if($user){
        $profile = $user->getOne('Profile');
        $extended = $profile->get('extended');
        $extended['subscribe'] = 1;
        $profile->set('extended', $extended['subscribe']);
        $profile->save();
        $modx->runSnippet('addNewContact', array('listId' => $listId, 'userId' => $user->get('id')));
    }
    return $AjaxForm->success('Вы зарегистрированы', array('success' => '#successReg', 'email' => $_POST['email']));
}

//$modx->log(1, print_r($_POST,1));

{'!AjaxForm' | snippet:[
            'snippet' =>'bxSender'
            'form' =>'@FILE chunks/forms/regForm.html'
            'activationEmailTpl' =>EmailTpl'     
            'usernameField' =>'email'
            'passwordField' =>'password'
            'validate'=>'nospam:blank,
            password:required:minLength=^8^,
            password_confirm:password_confirm=^password^,
            fullname:required:minLength=^2^,
            acceptRules2:required,
            usergroups:required,
            email:required:email'           
            ]}

{'!AjaxForm' | snippet:[
            'snippet' =>'bxSender'  
]}