mx.noackinfra.se has no CNAME records.
Question and response
Question
dig mx.noackinfra.se. NS
Answer
The response has no answer records.
Authority
noackinfra.se. 1402 SOA ns1.dnsserv.uk. mikael.no-ack.se. 2025110403 3600 900 604800 1209600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0