ldu.edu.cn.		30 IN SOA pdom.ldu.edu.cn. admin.ldu.edu.cn. (
				1713923126 ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				86400      ; expire (1 day)
				3600       ; minimum (1 hour)
				)

ldu.edu.cn.		30 IN TXT "v=spf1 include:spf.163.com -all"

Mail exchangers:
ldu.edu.cn.		30 IN MX 5 hzmx01.mxmail.netease.com.
ldu.edu.cn.		30 IN MX 10 hzmx02.mxmail.netease.com.

Name servers:
ldu.edu.cn.		30 IN NS sdom.ldu.edu.cn.
ldu.edu.cn.		30 IN NS pdom.ldu.edu.cn.