ytu.edu.cn.		30 IN SOA dns.ytu.edu.cn. root.ytu.edu.cn. (
				1713772215 ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				86400      ; expire (1 day)
				3600       ; minimum (1 hour)
				)

ytu.edu.cn.		30 IN TXT "v=spf1 ip4:202.194.116.86 ip6:2001:da8:7009:100::86
include:spf.icoremail.net -all"

Mail exchangers:
ytu.edu.cn.		30 IN MX 10 mail.ytu.edu.cn.

Name servers:
ytu.edu.cn.		30 IN NS sea.ytu.edu.cn.
ytu.edu.cn.		30 IN NS dns.ytu.edu.cn.