Arnt Gulbrandsen <arnt(_at_)oryx(_dot_)com> wrote:
One of the unintended advantages of TBR over greylisting is that it
can be used for a message recall feature. :-)
So can greylisting if you can reach into the queue. Which noone can
today, but if you're going to implement something new you might as well
implement a reach-into-the-queue feature as TBR.
Actually, reach-into-the-queue isn't a dependable recall. The
message my be queued becase of a 4xx error _after_ DATA while waiting
for content-analysis. To _deliver_ the mesage before the SMTP retry
would be a violation of protocol, but the message is clearly out there
and could be retrieved.
(We could start a thread on message recall if folks think this is
worth further discussion...)
John Leslie <john(_at_)jlc(_dot_)net>