speedtest.gtnet.ru has no MX records.
Question and response
Question
dig speedtest.gtnet.ru. MX
Answer
The response has no answer records.
Authority
gtnet.ru. 3600 SOA inn361.ru. inn.inn361.ru.gtnet.ru. 2026020902 86400 3600 604800 345600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0