_spf.newswebsite.com.ar has no MX records.
Question and response
Question
dig _spf.newswebsite.com.ar. MX
Answer
The response has no answer records.
Authority
newswebsite.com.ar. 43200 SOA ns1.evsis.com.ar. hostmaster.evsis.com.ar. 2015022636 21600 10800 604800 43200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0