Question and response
Question
dig _netblock1.seismic.com. TXT
Answer
_netblock1.seismic.com. 600 TXT "v=spf1 ip4:198.37.150.59/32 ip4:144.121.162.242/29 ip4:208.91.114.151/32 ip4:52.38.191.241/32 ip4:208.74.204.0/22 exists:%{i}._spf.mta.salesforce.com -all"
Authority
seismic.com. 172800 NS ns-1254.awsdns-28.org.
seismic.com. 172800 NS ns-1829.awsdns-36.co.uk.
seismic.com. 172800 NS ns-460.awsdns-57.com.
seismic.com. 172800 NS ns-611.awsdns-12.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0