pop.orbitelcom.com has no MX records.
Question and response
Question
dig pop.orbitelcom.com. MX
Answer
The response has no answer records.
Authority
orbitelcom.com. 3600 SOA auth1.america.net. dns.america.net. 2025100200 3600 600 864000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0