Question and response
Question
dig sparkpostmail.com. A
Answer
sparkpostmail.com. 60 A 65.9.175.129
sparkpostmail.com. 60 A 65.9.175.49
sparkpostmail.com. 60 A 65.9.175.99
sparkpostmail.com. 60 A 65.9.175.111
Authority
sparkpostmail.com. 172800 NS ns-1361.awsdns-42.org.
sparkpostmail.com. 172800 NS ns-1855.awsdns-39.co.uk.
sparkpostmail.com. 172800 NS ns-304.awsdns-38.com.
sparkpostmail.com. 172800 NS ns-775.awsdns-32.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0