mail.gazpromtelecom.ru has no MX records.
Question and response
Question
dig mail.gazpromtelecom.ru. MX
Answer
The response has no answer records.
Authority
gazpromtelecom.ru. 3600 SOA ns.gazpromtelecom.ru. root.gazpromtelecom.ru. 2026011401 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0