_acme-challenge.sockets.mcfr.uz has no MX records.
Question and response
Question
dig _acme-challenge.sockets.mcfr.uz.vmcl.ru. MX
Answer
The response has no answer records.
Authority
vmcl.ru. 300 SOA ns1.fr.ru. internet.action-media.ru. 2021092270 14400 180 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0