Thanks to everyone who responded to my question, both
on-list and off-list.
For posterity, here were my two mistakes:
(1) Assuming that systems like gmail were not using SPF
when they didn't reject "spf fail" cases during the
smtp protocol.
(2) Reversing the last two entries in an SPF record:
-all exp=spf-exp.%{d}"
instead of:
exp=spf-exp.%{d} -all"
Again, thanks for all the help.
- Bob
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