dns.cldin.net has no MX records.
Question and response
Question
dig dns.cldin.net. MX
Answer
The response has no answer records.
Authority
dns.cldin.net. 3600 SOA ns3.cldin.eu. hostmaster.dns.cldin.net. 1772222634 3600 900 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0