mx.vivai-vimara.com has no CNAME records.
Question and response
Question
dig mx.vivai-vimara.com. NS
Answer
The response has no answer records.
Authority
vivai-vimara.com. 2056 SOA dns.vivai-vimara.com. hostmaster.vivai-vimara.com. 1129062829 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0