smtp06.cidc.telus.com has no MX records.
Question and response
Question
dig smtp06.cidc.telus.com. MX
Answer
The response has no answer records.
Authority
smtp06.cidc.telus.com. 86400 SOA dns1.cidc.telus.com. support.cidc.telus.com. 2023101800 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0