mail.chezaubert.net has no MX records.
Question and response
Question
dig mail.chezaubert.net. MX
Answer
The response has no answer records.
Authority
chezaubert.net. 3600 SOA dove.chezaubert.net. jack.chezaubert.net. 1345 21600 1800 1814000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0