ns3.he.tucows.com has no MX records.
Question and response
Question
dig ns3.he.tucows.com. MX
Answer
The response has no answer records.
Authority
he.tucows.com. 300 SOA ns1.tucows.com. hostmaster.tucows.com. 2026012101 3600 1800 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0