usx.edu.cn.		30 IN SOA dns.usx.edu.cn. master.usx.edu.cn. (
				2023111215 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

usx.edu.cn.		30 IN TXT "v=spf1 mx mx:usx.edu.cn ip4:210.33.24.3 ~all"

Mail exchangers:
usx.edu.cn.		30 IN MX 0 email.usx.edu.cn.

Name servers:
usx.edu.cn.		30 IN NS dns.usx.edu.cn.
usx.edu.cn.		30 IN NS dns2.usx.edu.cn.