kae1.mailrelay.contabo.net has no MX records.
Question and response
Question
dig kae1.mailrelay.contabo.net. MX
Answer
The response has no answer records.
Authority
contabo.net. 3600 SOA ns1.contabo.net. hostmaster.contabo.de. 1772158331 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0