mx1.tmplconsip5000.telecomitalia.com has no CNAME records.
Question and response
Question
dig mx1.tmplconsip5000.telecomitalia.com. NS
Answer
The response has no answer records.
Authority
tmplconsip5000.telecomitalia.com. 2432 SOA dns3.interbusiness.it. staffdns.telecomitalia.it. 2014022755 86400 7200 2419200 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0