mx-ac3.telecomitalia.it has no CNAME records.
Question and response
Question
dig mx-ac3.telecomitalia.it. NS
Answer
The response has no answer records.
Authority
telecomitalia.it. 5219 SOA ns.telecomitalia.it. root.telecomitalia.it. 2026030401 86400 7200 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0