mail6.edupage.org has no CNAME records.
Question and response
Question
dig mail6.edupage.org. NS
Answer
The response has no answer records.
Authority
edupage.org. 600 SOA ns.edupage4.org. jan.asc.sk. 2026030616 7200 7200 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0