koru.cn.		30 IN SOA ns1.koru.cn. root.ns1.koru.cn. (
				42         ; serial
				36000      ; refresh (10 hours)
				600        ; retry (10 minutes)
				1800       ; expire (30 minutes)
				3600       ; minimum (1 hour)
				)

koru.cn.		30 IN TXT "v=spf1 include:spf.mxhichina.com ~all"
koru.cn.		30 IN TXT "v=DKIM1; k=rsa; p=MIBIjA"

koru.cn.		30 IN A	123.56.55.17

Mail exchangers:
koru.cn.		30 IN MX 10 mxbiz2.qq.com.
koru.cn.		30 IN MX 5 mxbiz1.qq.com.
koru.cn.		30 IN MX 15 mx3.em.dingtalk.com.
koru.cn.		30 IN MX 10 mx2.em.dingtalk.com.
koru.cn.		30 IN MX 5 mx1.em.dingtalk.com.