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What is OPES/SMTP?
From OPES charter:
The OPES [WG] has previously [...] developed a protocol suite for invocation and tracking of OPES services inside the net. The protocol suite includes a generic, application-agnostic protocol core (OCP Core) that is supplemented by profiles specific to the application-layer protocol used between the endpoints. So far, the WG has specified an OCP profile for HTTP, which supports OPES services that operate on HTTP messages.

In a next step, the WG will specify one or more OCP profiles that will support OPES services operating on SMTP
PPT Version