corp.skystark.net has no MX records.
Question and response
Question
dig corp.skystark.net. MX
Answer
The response has no answer records.
Authority
skystark.net. 10 SOA ns1.skystark.net. support.skystark.net. 1771930790 300 60 3600 10
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0