There is one, he should at least change "-all" to "?all" (or perhaps
"~all").
Using "-all" as the default in a SPF record does not have any readily
apparent effect on "Inbox" deliverability of SPF-authenticated mail to
GMail relative to "~all" based on domains whose mail and SPF records
I've been handling for many years. Do you have any actual evidence to
the contrary?
Is the fact that Google themselves uses "~all" and not "-all" enough
"actual evidence"? If not, is the fact that most other major email
providers (Yahoo, Outlook/Hotmail, iCloud, AOL, ...) do the same enough
"actual evidence"? If not, what kind of "actual evidence" are you
expecting?
These mail providers have more brainpower than any other company, and
would have more power than any other company to enforce a stricter policy
if this was actually a good thing in practice. Therefore smaller
providers that do not have that brainpower and power should IMHO use a
less strict policy, hence the "?all" I would advise.
Gregory
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