relay.tmn.ru has no MX records.
Question and response
Question
dig relay.tmn.ru. MX
Answer
The response has no answer records.
Authority
tmn.ru. 3600 SOA ns5.tmn.ru. root.ip.rostelecom.ru. 2024052803 86400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0