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Frank Ellermann wrote:
[...]
Yes, but "v=spf1 +a/24 +mx/24 ?all" used to be a "best guess policy",
it's not too bad: MTAs trying "call back verification" (CBV) query the
MX (or the IP if there's no MX) anyway.
I've always thought that best-guess was a horrendous idea. It pretends
authorization where there is none. And if you dare to apply reputation to
such a fake "Pass", it becomes a true collateral damage nightmare.
op= is for anything "yes/no" "0/1" "true/false", the least verbose way to
arrange such "properties" like "testing". Of course "options=" or
"flags=" or a similar name introducing such lists would be more obvious,
but also longer. The op= is a shorthand for optional.properties=. I
don't see an advantage for "testing=true helo=never" in comparison with a
combined list "op=testing.nohelo". op= is shorter, admittedly it's not
nicer.
Sometimes shorter is also nicer. :-)
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