m1.rg.net has no MX records.
Question and response
Question
dig m1.rg.net. MX
Answer
The response has no answer records.
Authority
rg.net. 14400 SOA rip.psg.com. hostmaster.psg.com. 1771795743 86400 3600 2592000 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0