pop.america.net has no MX records.
Question and response
Question
dig pop.america.net. MX
Answer
The response has no answer records.
Authority
america.net. 3600 SOA auth1.america.net. dns.america.net. 2026030203 3600 600 864000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0