mail.orbiscom.com has no CNAME records.
Question and response
Question
dig mail.orbiscom.com. NS
Answer
The response has no answer records.
Authority
orbiscom.com. 203 SOA dns2.mastercard.com. hostmaster.mastercard.com. 2010062869 14400 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0