mail.glsprefabricados.com has no MX records.
Question and response
Question
dig mail.glsprefabricados.com. MX
Answer
The response has no answer records.
Authority
glsprefabricados.com. 60 SOA ns1.cdmon.net. admin.glsprefabricados.com. 1655829320 10800 3600 604800 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0