d.ca-servers.ca has no MX records.
Question and response
Question
dig d.ca-servers.ca. MX
Answer
The response has no answer records.
Authority
ca-servers.ca. 3600 SOA ns01.cira.ca. admin-dns.cira.ca. 2026021301 3600 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0