Question and response
Question
dig spf.realsender.com. TXT
Answer
spf.realsender.com. 300 TXT "v=spf1 ip4:216.154.208.0/20 ip4:109.109.128.0/20 ip4:85.159.148.40 ip4:85.159.148.47 ip4:185.90.38.149 ~all"
Authority
spf.realsender.com. 172800 NS ns-1257.awsdns-29.org.
spf.realsender.com. 172800 NS ns-1640.awsdns-13.co.uk.
spf.realsender.com. 172800 NS ns-412.awsdns-51.com.
spf.realsender.com. 172800 NS ns-854.awsdns-42.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0