ip100-35.thdo.ncuk.net has no MX records.
Question and response
Question
dig ip100-35.thdo.ncuk.net. MX
Answer
The response has no answer records.
Authority
ncuk.net. 1800 SOA ns0.ncuk.net. hostmaster.ncuk.com. 2026012602 7200 3600 1209600 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0