ynao.ac.cn.		30 IN SOA ns1.sfn.cn. root.ns1.sfn.cn. (
				2024042418 ; serial
				600        ; refresh (10 minutes)
				120        ; retry (2 minutes)
				604800     ; expire (1 week)
				7200       ; minimum (2 hours)
				)

ynao.ac.cn.		30 IN TXT "v=spf1 include:spf.mail.cstnet.cn -all"

Mail exchangers:
ynao.ac.cn.		30 IN MX 10 mx.cstnet.cn.

Name servers:
ynao.ac.cn.		30 IN NS ns2.sfn.cn.
ynao.ac.cn.		30 IN NS ns1.sfn.cn.