Question and response
Question
dig flight.sparkpost.com. TXT
Answer
flight.sparkpost.com. 300 TXT "v=spf1 ip4:199.15.213.54/31 ip4:199.15.213.56/31 ip4:199.15.213.187 ip4:52.36.163.83 include:_spf.sparkpostmail.com -all"
Authority
flight.sparkpost.com. 172800 NS ns-1179.awsdns-19.org.
flight.sparkpost.com. 172800 NS ns-1788.awsdns-31.co.uk.
flight.sparkpost.com. 172800 NS ns-422.awsdns-52.com.
flight.sparkpost.com. 172800 NS ns-774.awsdns-32.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0