mx4.alumnforce.org has no CNAME records.
Question and response
Question
dig mx4.alumnforce.org. NS
Answer
The response has no answer records.
Authority
alumnforce.org. 10800 SOA dns200.anycast.me. tech.ovh.net. 2026030422 86400 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0