undefined.utg.link has no MX records.
Question and response
Question
dig undefined.utg.link. MX
Answer
The response has no answer records.
Authority
link. 300 SOA ns.trs-dns.com. trs-ops.tucows.com. 1771782511 1800 900 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0