prod-nomad03.geant.org has no MX records.
Question and response
Question
dig prod-nomad03.geant.org. MX
Answer
The response has no answer records.
Authority
geant.org. 900 SOA grid01.geant.net. hostmaster.transip.nl. 2017051537 3600 7200 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0