On Friday, June 25, 2004 11:00 AM, Wayne wrote:
Also note that the newest version of the Caller-ID PRA
algorithm depends on undocumented, non-standard and
depreciated headers, such as X-Envelope-To:. Go figure.
The reason we added these headers into the PRA algorithm was to
recognize that there are some forwarding MTAs that already insert the
equivalent of a Resnt- header into the message and therefore they are
already compatible with the Sender ID proposal.
Wayne is correct that these are non-standard headers, but it seemed like
a relatively benign addition in order to enable forwarders that already
add those headers to be deemed compliant.