syn.smithville.net has no MX records.
Question and response
Question
dig syn.smithville.net. MX
Answer
The response has no answer records.
Authority
smithville.net. 3600 SOA ns1.bluemarble.net. hostmaster.bluemarble.net. 2025061202 7200 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0