sof.gblnet.net has no MX records.
Question and response
Question
dig sof.gblnet.net. MX
Answer
The response has no answer records.
Authority
sof.gblnet.net. 86400 SOA ns.gblnet.net. vvv.gblnet.net. 2025092601 10800 1200 1209600 259200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0