mail.bbbell.it has no CNAME records.
Question and response
Question
dig mail.bbbell.it. NS
Answer
The response has no answer records.
Authority
bbbell.it. 3600 SOA dns1.bbbell.it. hostmaster.bbbell.it. 2026012101 28800 2400 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0