mx1.benesol.be has no CNAME records.
Question and response
Question
dig mx1.benesol.be. NS
Answer
The response has no answer records.
Authority
benesol.be. 3329 SOA ns1.benesol.be. support.benesol.be. 2025031301 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0