"v=spf1 ip4:128.253.150.144/30 ?all"
Question and response
Question
dig exchange.cornell.edu. SPF
Answer
exchange.cornell.edu. 300 SPF "v=spf1 ip4:128.253.150.144/30 ?all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0