ipv6.telus.net has no MX records.
Question and response
Question
dig ipv6.telus.net. MX
Answer
The response has no answer records.
Authority
ipv6.telus.net. 900 SOA mrhmondr-revdns-01.osc.tac.net. dnsadmin2.telus.com. 2022110706 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0