dragon.sams.uk.net has no MX records.
Question and response
Question
dig dragon.sams.uk.net. MX
Answer
The response has no answer records.
Authority
sams.uk.net. 1800 SOA marjory.ns.cloudflare.com. dns.cloudflare.com. 2396495713 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0