Question and response
Question
dig spf3.esker.fr. TXT
Answer
spf3.esker.fr. 3600 TXT "v=spf1 exists:%{i}._spf.mta.salesforce.com ~all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0