192.106.212.static.jazztel.es has no MX records.
Question and response
Question
dig 192.106.212.static.jazztel.es. MX
Answer
The response has no answer records.
Authority
192.106.212.static.jazztel.es. 86400 SOA dns1.jazzvisp.com. admin.jazztel.es. 2007060100 7200 7200 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0