On 24 Sep 2010, John R. Levine wrote:
> Good point.  So it's two things, lists should sign outgoing mail, and
> discard any incoming mail with dkim=discardable.

One thought - If lists are going to spend any time paying special
attention to DKIM, it would be easier for them to just always rewrite the
headers like so:

From: Joe User <[email protected]>
becomes
From: Joe User ([email protected]) <x...@invalid>

And thus avoid any problems no matter what the original sender's policy
is.

(Ok, it will silently break take-address-from-message features in the mail
client.  Adding a Cc: header listing the original From: address would
help with that.)

The fact that this would work brings up a separate flaw in DKIM that I
believe has been mentioned before.  There's not much of a solution to
it, though.

---- Michael Deutschmann <[email protected]>
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