mail16.interhost.it has no CNAME records.
Question and response
Question
dig mail16.interhost.it. NS
Answer
The response has no answer records.
Authority
interhost.it. 10648 SOA ns1.dnsitalia.net. info.interhost.it. 2026022300 3600 900 86400 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0