ns4.demysdns.co.uk has no MX records.
Question and response
Question
dig ns4.demysdns.co.uk. MX
Answer
The response has no answer records.
Authority
demysdns.co.uk. 3600 SOA ns0.demysdns.net. dnstech.comlaude.com. 1636463348 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0