smtpmx.qidc.telus.com has no CNAME records.
Question and response
Question
dig smtpmx.qidc.telus.com. NS
Answer
The response has no answer records.
Authority
qidc.telus.com. 1483 SOA dns01.lidc.telus.com. lidc.telus.com. 2022051700 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0