phx1.vpls.net has no MX records.
Question and response
Question
dig phx1.vpls.net. MX
Answer
The response has no answer records.
Authority
phx1.vpls.net. 38400 SOA ns1.vpls.net. support.vpls.net. 2026010601 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0