reject_all.cpp

#include <eosio/eosio.hpp>
#include <eosio/asset.hpp>
using namespace eosio;

CONTRACT receiver : public contract {
public:
   using contract::contract;

   ACTION noop(){}

   [[eosio::on_notify("*::transfer")]] 
   void watchtransfer(name from, name to, asset quantity, std::string memo) {
      if (to != get_self() || from == get_self()) return;
      check(false, "Do not send this account tokens.");
   }
};