public boolean isMember(InfoRequest infoRequest) throws MailChimpException {
    String post = post("/lists/member-info", infoRequest, new Function<InfoRequest, String>() {
      @Override public String apply(InfoRequest input) {
        return gson.toJson(input);
      }
    });
    System.out.println(post);
    return gson.fromJson(post, InfoRequest.Response.class).getSuccessCount() == infoRequest.getEmailsCount();
  }