dyna-ns.net has no MX records.
Question and response
Question
dig dyna-ns.net. MX
Answer
The response has no answer records.
Authority
dyna-ns.net. 10800 SOA ns1.dyna-ns.net. hostmaster.dyna-ns.net. 2025122307 16384 2048 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0