edns01.es.tdatacenter.com has no MX records.
Question and response
Question
dig edns01.es.tdatacenter.com. MX
Answer
The response has no answer records.
Authority
es.tdatacenter.com. 3600 SOA nsjc8hos10.telefonica.es. dnsadmin.es.tdatacenter.com. 2011112923 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0