mail.eicra.net has no CNAME records.
Question and response
Question
dig mail.eicra.net. NS
Answer
The response has no answer records.
Authority
eicra.net. 5667 SOA eicra.mercury.orderbox-dns.com. info.eicrasoft.com. 2024083026 7200 7200 2419200 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0