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Page 71: Message handling before filtering
The solid arrows illustrate how the message moves through the
system, and the diamonds are what happens to the message.
The "message routing" diamond is where all the @cam, @lists,
managed mail domain, etc. handling is done. It can be complicated.
We can extend the SMTP-time address checks into fully-fledged
message scanning (after the dot), or do it later in the process
(after the 250) -- while it's in the queue, or during delivery.
See also the next slide.
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