diff --git a/Log-Bounce.md b/Log-Bounce.md
index d256b5e..df83083 100644
--- a/Log-Bounce.md
+++ b/Log-Bounce.md
@@ -90,3 +90,20 @@ This is a permanent error; I've given up. Sorry it didn't work out.
 <ketoan@tanducco.com.vn>:
 user is over quota
 ```
+### Không tìm thấy người nhận
+
+```
+The original message was received at Mon, 9 Mar 2020 16:57:50 +0900
+from localhost [127.0.0.1]
+
+----- The following addresses had permanent fatal errors -----
+<quynh-vuvan@gate.sws.co.jp>
+(reason: 550 <quynh-vuvan@gate.sws.co.jp> ... User unknown)
+
+----- Transcript of session follows -----
+... while talking to [202.15.150.137]:
+>>> DATA
+<<< 550 <quynh-vuvan@gate.sws.co.jp> ... User unknown
+550 5.1.1 <quynh-vuvan@gate.sws.co.jp>... User unknown
+<<< 554 no valid recipients given
+```