Florin Andrei:
> I can't say I understand *why* the 1s rate delay makes the feedback and 
> the concurrency limit parameters irrelevant, so I guess it's time for me 
> to dig deeper into the documentation. :)

This takes some courage:
http://www.postfix.org/SCHEDULER_README.html

The concurrency of 1 is not documented, but it is the only practical
way to implement this. A rate delay of 1s doesn't have much effect
when you delay on one connection while 99 other connections are in
the middle delivering an email message to the same site.

        Wietse

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