prod.tucows.net has no MX records.
Question and response
Question
dig prod.tucows.net. MX
Answer
The response has no answer records.
Authority
prod.tucows.net. 300 SOA ns1.tucows.com. hostmaster.tucows.com. 2026012101 1800 900 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0