mxpool.hostedoffice.ag has no CNAME records.
Question and response
Question
dig mxpool.hostedoffice.ag. NS
Answer
The response has no answer records.
Authority
hostedoffice.ag. 300 SOA master.domainkunden.de. hostmaster.domainkunden.de. 2026022306 28800 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0