On Mon, Nov 17, 2008 at 02:06:48PM -0500, Wietse Venema wrote:
> > 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.
>
> You need PARALLEL delivery, not connection reuse limits.
Translation to OPs specific situation:
- Uninstall Exim on the upstream server
- Install Postfix 2.5.5 on the upstream server.
- Raise the destination concurrency limit to allow
use of downstream plant capacity, the default 20
is likely too low for this environment. A limit
of 100 or more may be more reasonable.
- Disable demand caching globally or with transport
used for this destination.
The place where this delivery channel needs to be tuned is upstream.
--
Viktor.
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