spf.movistar.es has no MX records.
Question and response
Question
dig spf.movistar.es. MX
Answer
The response has no answer records.
Authority
movistar.es. 3600 SOA dns2.movistar.es. admondns.tsm.es. 2017073423 28800 3600 2592000 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0