Question and response
Question
dig _spf.salesforce.com. TXT
Answer
_spf.salesforce.com. 3600 TXT "v=spf1 exists:%{i}._spf.mta.salesforce.com -all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0