reputation for the domain. I have trouble imagining why anyone would
think it's a good idea to get alignment by using third party domains
that recipients don't know.

Because recipients often can’t see (or don’t pay attention to) the domain name and the reputation system you postulate doesn’t exist. OTOH, getting alignment avoids a restrictive policy that might be associated with the original domain.

I think you're saying that I can always evade DMARC problems by putting an address I control on the From line and nobody will notice. That would mean that DMARC is useless.

If that's not what you're saying, could you clarify?

Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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