static.orange.es has no MX records.
Question and response
Question
dig static.orange.es. MX
Answer
The response has no answer records.
Authority
static.orange.es. 3600 SOA dns4.wanadoo.es. admin.orange.es. 2007111410 86400 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0