_spf_telus_com.nssi.telus.com has no CNAME records.
Question and response
Question
dig _spf_telus_com.nssi.telus.com. NS
Answer
The response has no answer records.
Authority
nssi.telus.com. 3600 SOA dns36.telus.com. dnsadmin2.telus.com. 2017101651 900 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0