On Mon, Nov 17, 2008 at 07:13:25PM +0100, Diego Castillo wrote:
> > I think anvil is a poor fit for the problem description.
> > Anvil monitors plant-wide rates, and may trigger client
> > backoff, while the OP wants a single connection re-use
> > limit, which does not require an external counting process,
> > each SMTP server alrwady has all the data it needs locally.
>
> I guess this means that the single connection re-use limit
> could be implemented inside each SMTP server, without any
> policy server. But it is not yet available in the current
> version of Postfix (I'm using 2.2 myself). Correct?
Yes, and the same is still true for 2.5 and 2.6 snapshots. A policy
service can force a 421 disconnect, but only at "MAIL FROM", which may
cause the upstream MTA to defer mail or slow down, ...
> The upstream is not caching connections because it is not
> delivering to multiple hosts. The farm is seen as a unique IP,
> highly available, to which all messages must be delivered.
It is then the case that the upstream gets zero value from connection
caching, and really should NOT do so. Can you work with the upstream
admin to disable the connection cache there?
> The need to balance is cosmetic now, but I'm looking for a
> solution for this issue because, if traffic grows, I'd like
> to be able to add servers to my farm, which right now would
> be useless.
As traffic grows, the upstream will need more concurrent connections.
Why do you believe you need a large machine farm to handle this traffic?
Is there a CPU-intensive processing stage? When does it happen
(pre-queue filter or milter? post-queue content_filter? ...)
--
Viktor.
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