mx1.afrinic.NET has no CNAME records.
Question and response
Question
dig mx1.afrinic.NET. NS
Answer
The response has no answer records.
Authority
afrinic.net. 3391 SOA ns1.afrinic.net. dns-admin.afrinic.net. 2026022302 14400 3600 36288000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0