Question and response
Question
dig spf1.chargify.com. TXT
Answer
spf1.chargify.com. 300 TXT "v=spf1 ip4:192.161.144.0/20 ip4:185.12.80.0/22 ip4:188.172.128.0/20 ip4:216.198.0.0/18 ip4:54.174.63.0/24 include:spf.mandrillapp.com ~all"
Authority
chargify.com. 172800 NS ns-11.awsdns-01.com.
chargify.com. 172800 NS ns-1231.awsdns-25.org.
chargify.com. 172800 NS ns-1841.awsdns-38.co.uk.
chargify.com. 172800 NS ns-974.awsdns-57.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0