mail.tabdigital.host has no CNAME records.
Question and response
Question
dig mail.tabdigital.host. NS
Answer
The response has no answer records.
Authority
tabdigital.host. 5105 SOA alex.tabdigital.eu. root.alex.tabdigital.eu. 2026020301 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0