pop2.trans-telco.net has no MX records.
Question and response
Question
dig pop2.trans-telco.net. MX
Answer
The response has no answer records.
Authority
trans-telco.net. 900 SOA ns1.telconet.net. abuse.telconet.net. 28 10800 3600 2419200 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0