de.seppmail.cloud has no CNAME records.
Question and response
Question
dig de.seppmail.cloud. NS
Answer
The response has no answer records.
Authority
seppmail.cloud. 3545 SOA ns.seppmail.cloud. hostmaster.seppmail.cloud. 2026030682 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0