Question and response
Question
dig relay.mailchannels.net. TXT
Answer
relay.mailchannels.net. 60 TXT "v=spf1 ip4:23.83.208.0/20 ip4:35.85.190.185/32 ~all"
Authority
mailchannels.net. 172800 NS ns-1131.awsdns-13.org.
mailchannels.net. 172800 NS ns-1837.awsdns-37.co.uk.
mailchannels.net. 172800 NS ns-242.awsdns-30.com.
mailchannels.net. 172800 NS ns-988.awsdns-59.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0