mailing.diademys.com has no MX records.
Question and response
Question
dig mailing.diademys.com. MX
Answer
The response has no answer records.
Authority
mailing.diademys.com. 3600 SOA ns0.clara.net. hostmaster.clara.net. 2024051405 172800 3600 1728000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0