%{i} is not one of %{d}'s mail servers.
Question and response
Question
dig exp._spf.fwd.ispnet.net. TXT
Answer
exp._spf.fwd.ispnet.net. 86400 TXT "%{i} is not one of %{d}'s mail servers."
Authority
fwd.ispnet.net. 172800 NS ns2.ispnet.net.
fwd.ispnet.net. 172800 NS ns1.ispnet.net.
fwd.ispnet.net. 172800 NS ns3.ispnet.net.
fwd.ispnet.net. 172800 NS ns4.ispnet.net.
fwd.ispnet.net. 172800 NS queens1.tinkelman.com.
Additional
ns1.ispnet.net. 86400 A 199.224.0.146
ns2.ispnet.net. 86400 A 199.224.0.154
ns3.ispnet.net. 86400 A 204.141.40.135
ns4.ispnet.net. 86400 A 100.8.228.75
queens1.tinkelman.com. 86400 A 199.224.15.11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0