diff --git a/Docker-Mail-Server.md b/Docker-Mail-Server.md
index 6b7f8ad..600651c 100644
--- a/Docker-Mail-Server.md
+++ b/Docker-Mail-Server.md
@@ -1,6 +1,15 @@
 # 环境准备
 
 1. 公网服务器，含公网IP
-2. 域名一个
-3. 服务器安装Docker和Docker Compose
-4. 
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+2. 域名一个,做好解析
+例如：
+
+| 类型 | 记录 | 值 |
+| --- | --- | --- |
+| A | mail | 服务器IP |
+| MX | @ | mail.xxx.xx |
+| TXT | @ | v=spf1 mx ~all |
+| TXT | _dmarc | v=DMARC1; p=quarantine; rua=mailto:dmarc.report@xxx.xx; ruf=mailto:dmarc.report@xxx.xx; fo=0; adkim=r; aspf=r; pct=100; rf=afrf; ri=86400; sp=quarantine |
+
+4. 服务器安装Docker和Docker Compose
+5. 
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