dynamic.amis.net has no MX records.
Question and response
Question
dig dynamic.amis.net. MX
Answer
The response has no answer records.
Authority
dynamic.amis.net. 3600 SOA ns1.amis.net. hostmaster.amis.net. 2017050500 28800 7200 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0