'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.
Sure, I don't really see how fiddling SMTP to allow envelope (+some
headers?) and body to be transported separately - which is what this would
boil down to - can have any real advantage. As Phillip suggests, existing
pull protocols can be very useful for certain application swhich currently
use SMTP, "mailing lists" /discussion groups for instance. This is also
done with POP, IMAP and HTTP of course.
--
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