smtp-eu01.ek.co has no MX records.
Question and response
Question
dig smtp-eu01.ek.co. MX
Answer
The response has no answer records.
Authority
ek.co. 600 SOA ns1-32.azure-dns.com. dns.jomax.net. 2023011203 28800 7200 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0