cluster2.nordicpeak.com has no MX records.
Question and response
Question
dig cluster2.nordicpeak.com. MX
Answer
The response has no answer records.
Authority
nordicpeak.com. 28800 SOA dns1.nordicpeak.se. info.nordicpeak.com. 378 28800 28800 604800 28800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0