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I understand the need to keep things simple, but this time the split
seemed a bit overkill. If needed, I'll redo the patch into a small
series. Thinking of it... I was unsure if it really made sense to split
out smtp/pop/imap patches instead of sending them all at once... :-)
As for the shutdown before close, it's needed to let the server know
we are leaving, instead of waiting until socket timeout. This is the
reason I need to keep the reference to the wrapped socket.
You don't usually configure maildrop servers to limit the number/rate of
connects as you do on smtp servers; still, you could get into problems
with stateful forewalls or the like.