mail.mallne.cloud has no CNAME records.
Question and response
Question
dig mail.mallne.cloud. NS
Answer
The response has no answer records.
Authority
mallne.cloud. 150 SOA ns4.stratoserver.net. hostmaster.strato-rz.de. 2020119192 86400 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0