diff --git a/Docker-Mail-Server.md b/Docker-Mail-Server.md
index 1891d48..f3413eb 100644
--- a/Docker-Mail-Server.md
+++ b/Docker-Mail-Server.md
@@ -1,4 +1,4 @@
 # 环境准备
 
 1. 公网服务器，含公网IP
-2. 
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+2. 域名一个
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