Question and response
Question
dig mail.zendesk.com. TXT
Answer
mail.zendesk.com. 3600 TXT "v=spf1 ip4:103.151.192.0/23 ip4:185.12.80.0/22 ip4:188.172.128.0/20 ip4:192.161.144.0/20 ip4:216.198.0.0/18 ~all"
Authority
zendesk.com. 172800 NS ns-1213.awsdns-23.org.
zendesk.com. 172800 NS ns-1858.awsdns-40.co.uk.
zendesk.com. 172800 NS ns-444.awsdns-55.com.
zendesk.com. 172800 NS ns-754.awsdns-30.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0