webmail.ikuspe.com has no CNAME records.
Question and response
Question
dig webmail.ikuspe.com. NS
Answer
The response has no answer records.
Authority
ikuspe.com. 10800 SOA dns3.servidoresdns.net. hostmaster.servidoresdns.net. 2006090205 21600 3600 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0