mail01.filter08.mta.whmpanels.com has no MX records.
Question and response
Question
dig mail01.filter08.mta.whmpanels.com. MX
Answer
The response has no answer records.
Authority
filter08.mta.whmpanels.com. 30 SOA ns1.wdp-gazduire.ro. server.contact.romarg.ro. 2023112800 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0