k110.mxout.mta4.net has no MX records.
Question and response
Question
dig k110.mxout.mta4.net. MX
Answer
The response has no answer records.
Authority
mta4.net. 3600 SOA dns41.cloudns.net. support.cloudns.net. 2024031401 7200 1800 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0