mailgate1.customer-virt.eu has no CNAME records.
Question and response
Question
dig mailgate1.customer-virt.eu. NS
Answer
The response has no answer records.
Authority
customer-virt.eu. 3597 SOA rdns1.internetx.de. ripe.internetx.de. 2026022600 10000 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0