antispam.cdlan.net has no CNAME records.
Question and response
Question
dig antispam.cdlan.net. NS
Answer
The response has no answer records.
Authority
cdlan.net. 543 SOA ns1.cdlan.net. mnt.cdlan.net. 3001347248 86400 3600 604800 6400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0