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RE: [ietf-dkim] Proposal: get rid of x=

2006-04-08 09:32:11
On Sat, 2006-04-08 at 10:07 -0400, Bill(_dot_)Oxley(_at_)cox(_dot_)com wrote:
On Apr 7, 2006, at 1:53 PM, Stephen Farrell wrote:

So a signature expiry failure doesn't mean message rejection, same  
as if the signature check failed because the message was mangled.

Policy of the receiving domain is out of scope for what we are doing here.

The effect of differing policies is the concern.  Sewer pipes increase
in size to avoid clogs.  The expiry of the message permits a bad actor
to light a precision fuse before dropping their message into the
flushing toilet. The effect of the expiry is that the pipe (allowance)
granted the message reduces at it travels.  When this becomes a problem,
each MTA will want to ensure more than some amount of time remains prior
to expiration.  It will be unpleasant up stream of the clog created by
the different and ever decreasing size pipes.

-Doug


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