Question and response
Question
dig mh.blackboard.com. TXT
Answer
mh.blackboard.com. 3600 TXT "v=spf1 ip4:69.196.241.0/24 include:amazonses.com -all"
Authority
blackboard.com. 172800 NS ns-1321.awsdns-37.org.
blackboard.com. 172800 NS ns-1824.awsdns-36.co.uk.
blackboard.com. 172800 NS ns-337.awsdns-42.com.
blackboard.com. 172800 NS ns-719.awsdns-25.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0