mail2.telefonica.es has no MX records.
Question and response
Question
dig mail2.telefonica.es. MX
Answer
The response has no answer records.
Authority
telefonica.es. 300 SOA dns1.movistar.es. please_set_email.absolutely.nowhere. 2032 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0