mx1.dtln.ru has no MX records.
Question and response
Question
dig mx1.dtln.ru. MX
Answer
The response has no answer records.
Authority
dtln.ru. 3600 SOA ns.dtln.ru. dns.dtln.ru. 2026012701 3600 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0