prg.gblnet.net has no MX records.
Question and response
Question
dig prg.gblnet.net. MX
Answer
The response has no answer records.
Authority
prg.gblnet.net. 86400 SOA ns.gblnet.net. vvv.gblnet.net. 2024090302 10800 1200 1209600 259200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0