BTW, I have seen spam using a real person's PGP sig, cut and pasted from
one of their messages.

> If we added the ability to include lines in local.cf or user_prefs like
> > validpgp 0x38AA1D47
> (a list of space-separated hex numbers), then THOSE specific signatures
> could score strong negatives, similar to a whitelist. (I'd like to see
> the ability for each user to set their score, perhaps with a
> > SCORE VALIDPGP -2.0
> line in local.cf or user_prefs.

Would you (or anyone else) really edit your config for each new
correspondent who sends you a PGP-signed message?   I doubt it,
I'm afraid.

For PGP/GPG to be useful as an unforgeable bonus-points mechanism, it
needs key distribution.  We can no longer just say "it has *some*
PGP signature" -- because spammers are actively forging them, cutting
them from other mails, etc.   as far as I know the only way to really
validate the sig is to (a) ensure the public key is on the keyring
and (b) run pgp/gpg at that point.

--j.


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