smtp05.cidc.telus.com has no MX records.
Question and response
Question
dig smtp05.cidc.telus.com. MX
Answer
The response has no answer records.
Authority
smtp05.cidc.telus.com. 86400 SOA dns1.cidc.telus.com. support.cidc.telus.com. 2024031800 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0