ns1.hosting.co.kr has no MX records.
Question and response
Question
dig ns1.hosting.co.kr. MX
Answer
The response has no answer records.
Authority
hosting.co.kr. 86400 SOA ns1.hosting.co.kr. admin.hosting.co.kr. 207 21600 1800 1209600 86400
Additional
The response has no additional records.