unallocated.star.net.uk has no MX records.
Question and response
Question
dig unallocated.star.net.uk. MX
Answer
The response has no answer records.
Authority
star.net.uk. 86400 SOA dns0.star.co.uk. abuse.star.net.uk. 2021051088 86400 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0