duapp.com.		30 IN SOA v1.bdydns.cn. sa.dudns.com. (
				2016101412 ; serial
				3600       ; refresh (1 hour)
				300        ; retry (5 minutes)
				2592000    ; expire (4 weeks 2 days)
				120        ; minimum (2 minutes)
				)

duapp.com.		30 IN TXT "v=spf1 ip4:111.13.102.31 ip4:111.13.102.32 ip4:111.13.102.160
ip4:111.13.102.161 a mx ptr ~all"

duapp.com.		30 IN A	180.149.132.118
duapp.com.		30 IN A	202.108.23.17

Mail exchangers:
duapp.com.		30 IN MX 10 csmail.n.shifen.com.

Name servers:
duapp.com.		30 IN NS v2.bdydns.cn.
duapp.com.		30 IN NS v3.bdydns.cn.
duapp.com.		30 IN NS v4.bdydns.cn.
duapp.com.		30 IN NS v1.bdydns.cn.