store has no MX records.
Question and response
Question
dig store. MX
Answer
The response has no answer records.
Authority
store. 900 SOA ns0.centralnic.net. hostmaster.centralnic.net. 355082 900 1800 6048000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0