rt-01.pch.net has no MX records.
Question and response
Question
dig rt-01.pch.net. MX
Answer
The response has no answer records.
Authority
pch.net. 600 SOA anyns.pch.net. hostmaster.pch.net. 2026022001 3600 600 604800 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0