_spflbc4.imn.ch has no CNAME records.
Question and response
Question
dig _spflbc4.imn.ch. NS
Answer
The response has no answer records.
Authority
imn.ch. 6075 SOA ns1.mailprofiler.ch. postmaster.mailprofiler.ch. 2024112501 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0