mail1.rdcint.ca has no MX records.
Question and response
Question
dig mail1.rdcint.ca. MX
Answer
The response has no answer records.
Authority
rdcint.ca. 600 SOA dns1.datacentres.rogers.com. support.datacentres.rogers.com. 2025071535 10800 3600 604800 1200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0