hdu.edu.cn.		30 IN SOA ns.hdu.edu.cn. admin.example.com. (
				2100000501 ; serial
				10800      ; refresh (3 hours)
				900        ; retry (15 minutes)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)

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

hdu.edu.cn.		30 IN A	218.75.123.169

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

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