mail.oxfordnetworks.net has no MX records.
Question and response
Question
dig mail.oxfordnetworks.net. MX
Answer
The response has no answer records.
Authority
oxfordnetworks.net. 3600 SOA dns1.firstlight.net. postmaster.no.email.please. 598392273 3600 600 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0