ns2.echoes.net has no MX records.
Question and response
Question
dig ns2.echoes.net. MX
Answer
The response has no answer records.
Authority
echoes.net. 1800 SOA ns1.echoes.net. hostmaster.echoes.net. 2025110401 10800 3600 1209600 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0