'Pull' is relevant within the context of obtaining content from sources that
you regularly receive content from, it is not a generic email replacement
protocol.
We already have two pull protocols, NNTP and RSS. NNTP suffers from the
practical dependence on the broken peer-to-peer flood fill routing model.
Although this is not essential to the protocol one of the responses of
usenet to their spam problem was to demand that isps block external nntp
connections. If you are on comcast you cannot connect to GMANE.
RSS is the emergent protocol, it supports richer content than NNTP, is
considerably simpler and has a significant user base even though there are
practically no clients (!)
My skepticism here is towards the distinctions made between push and pull.
If you look at the standard email transfer it involves a push SMTP
interaction followed by a pull POP interaction. In NNTP you have the same
type of interaction but the partitioning is slightly different. In effect
you have the world pushing garbage at your news server and then pull out the
small quantity that you are interested in.
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