mail.altimber.com has no MX records.
Question and response
Question
dig mail.altimber.com. MX
Answer
The response has no answer records.
Authority
altimber.com. 60 SOA ns1.dondominio.com. dnsadmin.dondominio.com. 2025101508 10800 1800 691200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0