protected function validateEmailExistsUser()
    {
        $field = 'email';
        $value = $this->getSubmitted($field);

        if ($this->isError($field) || !isset($value)) {
            return null;
        }

        $user = $this->user->getByEmail($value);

        if (empty($user['status'])) {
            $this->setErrorUnavailable($field, $this->translation->text('E-mail'));
            return false;
        }

        $this->setSubmitted($field, $user);
        return true;
    }