bulk.connection.ca has no MX records.
Question and response
Question
dig bulk.connection.ca. MX
Answer
The response has no answer records.
Authority
connection.ca. 38400 SOA ns1.gtt.net. dnsadmin.gtt.net. 2026022601 10800 3600 604800 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0