slndns.co.uk has no MX records.
Question and response
Question
dig slndns.co.uk. MX
Answer
The response has no answer records.
Authority
slndns.co.uk. 600 SOA ns-fh.ui-dns.co.uk. dnsadmin.ionos.com. 2025092316 14400 3600 605000 600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0