sfe01.mdl.net has no MX records.
Question and response
Question
dig sfe01.mdl.net. MX
Answer
The response has no answer records.
Authority
mdl.net. 3600 SOA sfe01.mdl.net. hotline.mdl.net. 2025043015 3600 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0