Hi,
At 14:25 17-11-2005, Stephen Farrell wrote:
And can't the threats document (& later, whatever relevant spec) not
just say "don't do that" and thus avoid the problem?

The DKIM draft mentions:

  "Under no circumstances should an unsigned header field be displayed
   in any context that might be construed by the end user as having been
   signed."

It could be extended further:

The "From:" header should not be signed if it contains more than one sending address.

Regards,
-sm

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