lctu.cn.		30 IN SOA . hostmaster.nameserver. (
				269        ; serial
				28800      ; refresh (8 hours)
				7200       ; retry (2 hours)
				604800     ; expire (1 week)
				5          ; minimum (5 seconds)
				)

lctu.cn.		30 IN TXT "v=spf1 include:spf.mail.qq.com ~all"

Mail exchangers:
lctu.cn.		30 IN MX 5 mxbiz1.qq.com.
lctu.cn.		30 IN MX 10 mxbiz2.qq.com.