sea0020smg2.frontedge.net has no MX records.
Question and response
Question
dig sea0020smg2.frontedge.net. MX
Answer
The response has no answer records.
Authority
frontedge.net. 3600 SOA castor.frontedge.net. postmaster.frontedge.net. 2025021167 7200 900 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0