mail.integratelecom.com has no CNAME records.
Question and response
Question
dig mail.integratelecom.com. NS
Answer
The response has no answer records.
Authority
integratelecom.com. 3567 SOA nsx.integraonline.com. itops.zayo.com. 2025100801 300 7200 604800 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0