engine2.mailmailmail.net has no MX records.
Question and response
Question
dig engine2.mailmailmail.net. MX
Answer
The response has no answer records.
Authority
mailmailmail.net. 3600 SOA ns1.hyp.net. hostmaster.domeneshop.no. 1771073499 14400 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0