Scott Kitterman wrote:
publish an SPF2 record that says spf2.0/pra +all. That's an
effective opt-out of Sender-ID.
v=spf1 means MAIL FROM only, and nothing else, no united PRA -
SUBMITTER - Caller-Id - Domain Key stuff. There's no need to
"opt out" from something when you never opted-in before.
If you want to "opt-in" to these schemes you're free to try it.
Maybe it works for you, I doubt it, and I'm sure that PRA won't
work for me.
we can gain a lot of momentum by leveraging off of the SPF
Deliberately misinterpreting sender policies would be abuse.
Wayne's idea "spf2/pra,spf" vs. "spf2/spf" is better, only the
latter is compatible with v=spf1.