Question and response
Question
dig sendersv4b.mail.linode.com. TXT
Answer
sendersv4b.mail.linode.com. 300 TXT "v=spf1 ip4:23.21.109.197 ip4:23.21.109.212 ip4:52.49.235.189 ip4:52.49.201.246 ~all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0