gdou.edu.cn.		30 IN SOA dns1.gdou.edu.cn. root.gdou.edu.cn. (
				2020091954 ; serial
				30         ; refresh (30 seconds)
				30         ; retry (30 seconds)
				360        ; expire (6 minutes)
				3600       ; minimum (1 hour)
				)

gdou.edu.cn.		30 IN TXT "v=spf1" "3600"
"INclude:spf.mail.qq.com" "~all"

Mail exchangers:
gdou.edu.cn.		30 IN MX 5 mxbiz1.qq.com.
gdou.edu.cn.		30 IN MX 10 mxbiz2.qq.com.

Name servers:
gdou.edu.cn.		30 IN NS dns2.gdou.edu.cn.
gdou.edu.cn.		30 IN NS dns1.gdou.edu.cn.