I never got the OPES idea. Of course folks can do their A/V
and SIEVE and SIQ (I-D.irtf-asrg-iar-howe-siq-03) businesss
on a separate box, they can even outsource it, but they do
this already without OPES.
So what's the technical point of OPES wrt mail ?
OPES' technical point is to have an application agnostic core
call-out protocol (OCP) that is being enhanced by protocol specific
adaptations (OCP profiles).
Other profiles could be defined that describe how to work with
certain data files (such as a MIME file) without any specific protocol.
This will allow to create such a separate filter box that you mentioned
but have it negotiate with different proxies and gateways what kind of
protocol/data it can handle.
Today a protocol such as ICAP is hacked and misued to work with other
protocols than HTTP.
Martin
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