diff --git a/src/main/java/ntou/auction/spring/NtouAuctionJavaApplication.java b/src/main/java/ntou/auction/spring/NtouAuctionJavaApplication.java
index 4bedc9e..1f84206 100644
--- a/src/main/java/ntou/auction/spring/NtouAuctionJavaApplication.java
+++ b/src/main/java/ntou/auction/spring/NtouAuctionJavaApplication.java
@@ -6,12 +6,14 @@
 import org.springframework.boot.autoconfigure.sql.init.SqlDataSourceScriptDatabaseInitializer;
 import org.springframework.boot.autoconfigure.sql.init.SqlInitializationProperties;
 import org.springframework.context.annotation.Bean;
+import org.springframework.scheduling.annotation.EnableAsync;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
 import javax.sql.DataSource;
 
 @SpringBootApplication
 @EnableScheduling
+@EnableAsync
 public class NtouAuctionJavaApplication {
 
     public static void main(String[] args) {
diff --git a/src/main/java/ntou/auction/spring/mail/EmailService.java b/src/main/java/ntou/auction/spring/mail/EmailService.java
index afa1752..964ecb7 100644
--- a/src/main/java/ntou/auction/spring/mail/EmailService.java
+++ b/src/main/java/ntou/auction/spring/mail/EmailService.java
@@ -10,6 +10,7 @@
 import org.springframework.mail.MailException;
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.mail.javamail.MimeMessagePreparator;
+import org.springframework.scheduling.annotation.Async;
 import org.springframework.stereotype.Service;
 
 import java.util.Date;
@@ -26,6 +27,7 @@ public EmailService(JavaMailSender mailSender, UserService userService, AppConfi
         this.appConfig = appConfig;
     }
 
+    @Async
     public void sendMailBidSuccess(Long userId, Product product) {
 
         if (userService.get(userId).isEmpty()) {
@@ -89,6 +91,7 @@ public void sendMailBidFailed(Long userId, Product product) {
         }
     }
     */
+    @Async
     public void sendMailOrderEstablished(Long userId, Order order) {
 
         if (userService.get(userId).isEmpty() || userService.get(order.getSellerid()).isEmpty()) {
@@ -139,6 +142,7 @@ public void sendMailOrderEstablished(Long userId, Order order) {
         }
     }
 
+    @Async
     public void sendMailOrderUpdate(Long userId, Order order) {
 
         if (userService.get(userId).isEmpty() || userService.get(order.getSellerid()).isEmpty()) {