preprod.telindustelecom.lu has no MX records.
Question and response
Question
dig preprod.telindustelecom.lu. MX
Answer
The response has no answer records.
Authority
telindustelecom.lu. 3600 SOA ns1.telindustelecom.lu. dns.telindus.lu. 2014070309 10800 3600 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0