ycit.cn.		30 IN SOA pri.ycit.cn. noc.ycit.cn. (
				2019052575 ; serial
				28800      ; refresh (8 hours)
				60         ; retry (1 minute)
				604800     ; expire (1 week)
				86400      ; minimum (1 day)
				)

ycit.cn.		30 IN TXT "v=spf1" "a" "mx" "~all"

Mail exchangers:
ycit.cn.		30 IN MX 1 mail.ycit.cn.

Name servers:
ycit.cn.		30 IN NS pri.ycit.cn.