ip-cust07011.telefonica-ca.net has no MX records.
Question and response
Question
dig ip-cust07011.telefonica-ca.net. MX
Answer
The response has no answer records.
Authority
telefonica-ca.net. 86400 SOA ns1.dominioabsoluto.com. hostmaster.ns1.dominioabsoluto.com. 1771863403 14400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0