code: public void forgotPassword(String email)
      {
          if (email == null) {
              return;
          }
          Object[] methodArgs = new Object[1];
          Map<String,Object> options = new HashMap<>();
          methodArgs[0] = options;
          options.put("email", email);
          getDDP().call("forgotPassword", methodArgs, new DDPListener() {
              @Override
              public void onResult(Map<String, Object> jsonFields) {
                  handleLoginResult(jsonFields);
              }
          });
      }
docs: Sends password reset mail to specified email address
  @param email email address of user