Question and response
Question
dig spf-listserv.isc.upenn.edu. TXT
Answer
spf-listserv.isc.upenn.edu. 900 TXT "v=spf1 ip4:130.91.209.88 ip4:130.91.209.131 ip6:2607:f470:1004:18::e ip6:2607:f470:1004:18::16 ~all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0