mx1.activenetwork.it has no CNAME records.
Question and response
Question
dig mx1.activenetwork.it. NS
Answer
The response has no answer records.
Authority
activenetwork.it. 5062 SOA auth1.activenetwork.it. hostmaster.activenetwork.it. 2026012202 86400 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0