David Thornton:
> I think you could set the transport for "defered" to a relay host that is
> just another instance running on the same server (on a different interface)
> that is using a proper disk for queues.
>
> anyone care to comment?

That seems to be a popular approach. Use expensive equipment only
for the first delivery attempt, and use fallback_relay to send all
undeliverable mail to a queue on slower storage.

The only glitch is that currently the Postfix SMTP client does not
use fallback_relay when an SMTP session fails in the middle of a
delivery. Changing this is not a great deal but it requires moving
some code loops around.

        Wietse
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