douala0.orange.cm has no MX records.
Question and response
Question
dig douala0.orange.cm. MX
Answer
The response has no answer records.
Authority
orange.cm. 300 SOA yaounde0.orange.cm. noc.orange.cm. 2022070500 21600 3600 1814400 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0