mail-in-131.sge.net has no MX records.
Question and response
Question
dig mail-in-131.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