[ih] principles of the internet

[Tony Finch]

On Thu, 3 Jun 2010, Dave Crocker wrote:
>
> Email later added data integrity, through MIME Content-MD5, and as a
> side-effect of content protection through PEM, PGP or S/MIME and, more
> recently, DKIM, if one is loose about the function.  It also added delivery
> confirmation and error reporting via DSN and MDN notifications.  It had
> non-standardized non-delivery notices pretty much from the start; these were
> later standardized.  These all provide a pretty good platform for developing a
> re-transmission mechanism, if the sender wishes to pursue it.

Sounds like a recipe for loops to me :-)

Tony.
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