Thorsten Glaser:
> On Thu, 28 Feb 2013, Wietse Venema wrote:
> 
> > > That?s untrue because it certainly makes a difference whether you
> > > send mails in parallel or serial, especially when the receiving
> > 
> > Connection caching has nothing to do with concurrency. Sheesh.
> 
> I was assuming that, when you already have a connection to a
> receiving MX, you?d not open another one but reuse the existing

Concurrency is the number of simultaneous connections.

It has nothing to do with connection caching, which is using one
connection for more than one transaction.

Both are configurable with Postfix.

        Wietse

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