mxin.mygrande.net has no MX records.
Question and response
Question
dig mxin.mygrande.net. MX
Answer
The response has no answer records.
Authority
mygrande.net. 3600 SOA ns3.lsn.net. root.lsn.net. 2025010304 10800 3600 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0