mx.ungleich.it has no CNAME records.
Question and response
Question
dig mx.ungleich.it. NS
Answer
The response has no answer records.
Authority
ungleich.it. 3600 SOA ns.inwx.de. hostmaster.inwx.de. 2025110200 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0