diff --git a/sources/tech/20161201 How to Build an Email Server on Ubuntu Linux.md b/sources/tech/20161201 How to Build an Email Server on Ubuntu Linux.md
index 075b6d54b9..f46891b365 100644
--- a/sources/tech/20161201 How to Build an Email Server on Ubuntu Linux.md	
+++ b/sources/tech/20161201 How to Build an Email Server on Ubuntu Linux.md	
@@ -1,4 +1,5 @@
 translating by dongdongmian
+translating by WangYihang
 
 How to Build an Email Server on Ubuntu Linux
 ============================================================