mail.jotazo.com has no CNAME records.
Question and response
Question
dig mail.jotazo.com. NS
Answer
The response has no answer records.
Authority
jotazo.com. 412 SOA ns.jotazo.com. mail.jotazo.com. 2025122901 7200 540 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0