On Fri, May 15, 2015 at 1:28 PM, Dave Crocker <[email protected]> wrote:
> Performing DKIM/SPF validation upon receipt
>
There already exist several implementations of each of these, so I would
say that they are currently deployed rather widely, making our cost
near-zero. Plus, any DMARC operator already has at least one of them going.
DKIM-signing all outbound mail.
>
Let's say that's close to zero cost as well.
One thing absent from your list is conditional signatures, which is John's
idea, and is a special case of both of these. I've implemented it now in
libopendkim as a compile-time experimental feature, and it took me about
four hours including testing. I just have to add it to the plugin that
uses the library, and it'll be available for others to play with.
-MSK
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