"v=spf1 mx ptr -all"
Question and response
Question
dig calacoop.com.ar. SPF
Answer
calacoop.com.ar. 3600 SPF "v=spf1 mx ptr -all"
Authority
calacoop.com.ar. 3600 NS ns1.calacoop.com.ar.
Additional
ns1.calacoop.com.ar. 3600 A 179.0.224.42
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0