mx2.pvenezia.com has no CNAME records.
Question and response
Question
dig mx2.pvenezia.com. NS
Answer
The response has no answer records.
Authority
pvenezia.com. 1509 SOA ns1.pvenezia.com. root.pvenezia.com. 1998081123 8640 360 60480 8640
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0