mail.gross.com.ua has no MX records.
Question and response
Question
dig mail.gross.com.ua. MX
Answer
The response has no answer records.
Authority
gross.com.ua. 3600 SOA ns1.promdns.net. noc.prom.ua. 2026021902 43200 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0