ny.frontiernet.net has no MX records.
Question and response
Question
dig ny.frontiernet.net. MX
Answer
The response has no answer records.
Authority
ny.frontiernet.net. 21600 SOA auth.roch.ny.frontiernet.net. hostmaster.frontiernet.net. 2602180008 1800 300 604800 21600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0