ns1.hwclouds-dns.com has no MX records.
Question and response
Question
dig ns1.hwclouds-dns.com. MX
Answer
The response has no answer records.
Authority
hwclouds-dns.com. 300 SOA ns1.hwclouds-dns.com. hwclouds\.cs.huawei.com. 2017063001 7200 900 1209600 300
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0