add check

@@ -110,6 +110,11 @@ public class TencentMktServiceImpl implements ITencentMktService {
 
 		// 调用gateway的发送验证码请求
 		AsyncFuture<ApiResponse> response = service.get("sms.sendCode", gatewayUrl + "?" + param, null, ApiResponse.class, null);
+
+		if(response.get().getCode() == 404){
+			log.warn("call sms.sendCode. user is exist. area={}, mobile={}", area, mobile);
+			return new ApiResponse(502, "仅限新用户领取哦！");
+		}
 		return response.get();
 	}