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