Question and response
Question
dig alimail-access-agent-ay29.aliyun.com. NS
Answer
alimail-access-agent-ay29.aliyun.com. 5 CNAME alimail-access-agent-ay29.aliyun.com.gds.alibabadns.com.
Authority
gds.alibabadns.com. 600 SOA gdsns1.alibabadns.com. none. 2018122017 1800 600 3600 360
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0