158-167-136-83.cust.keyyo.net has no MX records.
Question and response
Question
dig 158-167-136-83.cust.keyyo.net. MX
Answer
The response has no answer records.
Authority
cust.keyyo.net. 300 SOA cust.keyyo.net. mail.cust.keyyo.net. 2019101701 300 300 1700000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0