mail.ameth.org has no CNAME records.
Question and response
Question
dig mail.ameth.org. NS
Answer
The response has no answer records.
Authority
ameth.org. 10494 SOA ns3.korehosting.net. koree.koree.net. 2026022412 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0