mailfilter1.ehiweb.it has no CNAME records.
Question and response
Question
dig mailfilter1.ehiweb.it. NS
Answer
The response has no answer records.
Authority
ehiweb.it. 835 SOA ns18.ehiweb.it. hosting.ehiweb.it. 1768238862 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0