ipv4.at.ungleich.ch has no MX records.
Question and response
Question
dig ipv4.at.ungleich.ch. MX
Answer
The response has no answer records.
Authority
ipv4.at.ungleich.ch. 3600 SOA dns1.ungleich.ch. root.ungleich.ch. 2021081401 86400 7200 2419200 604800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0