rvlw38018.ciberserver.com has no MX records.
Question and response
Question
dig rvlw38018.ciberserver.com. MX
Answer
The response has no answer records.
Authority
ciberserver.com. 86400 SOA ns1.ciberserver.net. status.ciberconceito.com. 2026030501 3600 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0