smartsecurity.asia.	30 IN SOA e.ezdnscenter.com. dnsadmin.ezdnscenter.com. (
				1691418005 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

smartsecurity.asia.	30 IN TXT "v=spf1 include:spf.chengmail.cn ~all"

Mail exchangers:
smartsecurity.asia.	30 IN MX 20 mx2.chengmail.cn.
smartsecurity.asia.	30 IN MX 10 mx1.chengmail.cn.

Name servers:
smartsecurity.asia.	30 IN NS e.ezdnscenter.com.
smartsecurity.asia.	30 IN NS f.ezdnscenter.com.