ns.registrar.cm has no MX records.
Question and response
Question
dig ns.registrar.cm. MX
Answer
The response has no answer records.
Authority
registrar.cm. 3600 SOA ns1.cirt.cm. admin.cirt.cm. 2025102004 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0