billing.columbus.te.ua has no MX records.
Question and response
Question
dig billing.columbus.te.ua. MX
Answer
The response has no answer records.
Authority
columbus.te.ua. 3600 SOA ns1.columbus.te.ua. noc.columbus.te.ua. 2021081618 86400 7200 604800 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0