Question and response
Question
dig _s21dpw3yy3.sdmarc.net. TXT
Answer
_s21dpw3yy3.sdmarc.net. 600 TXT "v=spf1 exists:%{i}._spf.sparkpostmail.com ~all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0