mail.westeros.cloud has no CNAME records.
Question and response
Question
dig mail.westeros.cloud. NS
Answer
The response has no answer records.
Authority
westeros.cloud. 10506 SOA dns1.westeros.cloud. lflynn.hostnexus.com. 1619416151 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0