[ietf-dkim] Corner cases and loose ends, was , draft-vesely-dkim-joint-sigs

[Murray S. Kucherawy]

> -----Original Message-----
> From: John R. Levine [mailto:johnl at iecc.com]
> Sent: Monday, September 27, 2010 8:06 PM
> To: Murray S. Kucherawy
> Cc: DKIM List
> Subject: Re: [ietf-dkim] Corner cases and loose ends, was , draft-
> vesely-dkim-joint-sigs
> 
> > That no workable envelope-level DKIM equivalent has materialized to
> date
> > is unfortunate.
> 
> Not for lack of trying, but I just don't see how you could prevent bad
> guys from replaying good envelopes on bad mail.

Yeah.  Short-lived keys is the best thing I can come up with.

Do you think it's worth a shot?