nl.ns.saddle.network has no MX records.
Question and response
Question
dig nl.ns.saddle.network. MX
Answer
The response has no answer records.
Authority
saddle.network. 1800 SOA burt.ns.cloudflare.com. dns.cloudflare.com. 2397751579 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0