twt.edu.cn.		30 IN SOA ns.twt.edu.cn. admin.tju.edu.cn. (
				2100000391 ; serial
				3600       ; refresh (1 hour)
				300        ; retry (5 minutes)
				86400      ; expire (1 day)
				3600       ; minimum (1 hour)
				)

twt.edu.cn.		30 IN TXT "v=spf1" "include:spf.inmail.twtstudio.com"
"~all"

Mail exchangers:
twt.edu.cn.		30 IN MX 5 inmail.twtstudio.com.

Name servers:
twt.edu.cn.		30 IN NS dns1.tju.edu.cn.
twt.edu.cn.		30 IN NS dns2.tju.edu.cn.