space has no MX records.
Question and response
Question
dig space. MX
Answer
The response has no answer records.
Authority
space. 900 SOA ns0.centralnic.net. hostmaster.centralnic.net. 3001932424 900 1800 6048000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0