dns4.sge.net has no MX records.
Question and response
Question
dig dns4.sge.net. MX
Answer
The response has no answer records.
Authority
sge.net. 3600 SOA dns1.sge.net. servicedesk.sge.net. 2026012900 7200 1800 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0