sockeye.telusmobility.com has no MX records.
Question and response
Question
dig sockeye.telusmobility.com. MX
Answer
The response has no answer records.
Authority
telusmobility.com. 300 SOA dns8.telus.com. dnsadmin2.telus.com. 2021052771 900 7200 3600000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0