server1.jdu22.top has no MX records.
Question and response
Question
dig server1.jdu22.top. MX
Answer
The response has no answer records.
Authority
top. 3600 SOA a.zdnscloud.com. td_dns_gtld.knet.cn. 1395090501 600 200 2491200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0