ia.ac.cn.		6 IN SOA ia.ac.cn. sunserver.ia.ac.cn. (
				20200720   ; serial
				3600       ; refresh (1 hour)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				10800      ; minimum (3 hours)
				)

ia.ac.cn.		30 IN TXT "MS=BFAF684EF46FC11C88DC704CF39A6161B1FE5682"
ia.ac.cn.		30 IN TXT "v=spf1 include:spf.mail.cstnet.cn -all"

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

Name servers:
ia.ac.cn.		30 IN NS sunserver.ia.ac.cn.