minerva.ttd.net has no MX records.
Question and response
Question
dig minerva.ttd.net. MX
Answer
The response has no answer records.
Authority
ttd.net. 7200 SOA minerva.ttd.net. hostmaster.ttd.net. 2017011786 86400 7200 2592000 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0