> Mutation of header fields can be dealt with if the signer is able to > save the contents of the fields it signs, and those saved versions > are what is used during verification. Verifiers can then restore > the save versions if verification passes.
You could write software that did that, but I have never seen a plausible scenario where it'd be useful. How many mailing lists do you subscribe to where you need to do spam filtering on the mail that comes through the list? Me neither. (I do bozo filtering, but the bozos are neither spammers nor forgers, just bozos, and I filter on their From: lines.) If bad guys try to turn the clock back to 1995 and use mailing lists as spam amplifiers, the solution will be the same it was ten years ago, to fix the list software to keep the bad guys out, not to do filtering at the recipient end. R's, John _______________________________________________ ietf-dkim mailing list http://dkim.org