arrival.puaramos.com has no MX records.
Question and response
Question
dig arrival.puaramos.com. MX
Answer
The response has no answer records.
Authority
puaramos.com. 3600 SOA ns1.name.com. hostmaster.nsone.net. 1685445484 43200 7200 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0