dns48.telus.com has no MX records.
Question and response
Question
dig dns48.telus.com. MX
Answer
The response has no answer records.
Authority
telus.com. 3600 SOA dns40.telus.com. dnsadmin2.telus.com. 2019102507 900 7200 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0