Question and response
Question
dig spam.tosspayments.com. TXT
Answer
spam.tosspayments.com. 300 TXT "v=spf1 ip4:211.170.234.72 ip4:211.170.234.73 ip4:211.170.234.74 -all"
Authority
tosspayments.com. 172800 NS ns-1420.awsdns-49.org.
tosspayments.com. 172800 NS ns-1909.awsdns-46.co.uk.
tosspayments.com. 172800 NS ns-216.awsdns-27.com.
tosspayments.com. 172800 NS ns-826.awsdns-39.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0