From: Wietse Venema (wietseporcupine.org)
Date: Wed May 02 2007 - 09:36:59 CDT

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Jorey Bump:
> My server has been experiencing a noncritical issue with concurrency
> limits on a few remote hosts:
>
> warning: Connection concurrency limit exceeded: 11 from
> mx.example.com[192.168.1.2] for service smtp

This record is logged by the SMTP server process, which is
responsible for RECEIVING mail.

It's always a good idea to consider the entire error record
not just the last portion.

> After reading this guide:
>
> http://www.postfix.org/TUNING_README.html#rope
>
> I've decided to lower this parameter from the default of 20:
>
> default_destination_concurrency_limit = 10

These are for DELIVERING mail.

        Wietse

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