controller.privio.cloud has no MX records.
Question and response
Question
dig controller.privio.cloud. MX
Answer
The response has no answer records.
Authority
privio.cloud. 1800 SOA oaklyn.ns.cloudflare.com. dns.cloudflare.com. 2397639585 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0