smtp.gcsip.nl has no MX records.
Question and response
Question
dig smtp.gcsip.nl. MX
Answer
The response has no answer records.
Authority
gcsip.nl. 60 SOA dns1.p04.nsone.net. hostmaster.nsone.net. 1743692958 7200 7200 2419200 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0