On Mon, Jan 30, 2012 at 02:33:53PM -0800, Peter Scott wrote:
> Sending mail via Amazon happens via piping it to a program that
> makes an HTTP connection.  This takes about 0.5 seconds.

Postfix is a SMTP-Server/-Client, no HTTP-Client.

>                                                           We have a
> high volume of mail that needs to be delivered at a rate of at least
> 10 messages per second, and our Amazon account supports up to 90/s.

Postfix themself can easily handle this rate over SMTP.

>                               Amazon says that concurrency is the
> way to increase the rate: make multiple simultaneous connections.

You are confused. Postfix uses multiple SMTP-Connections if there is
enough mail.

Bastian

-- 
Oh, that sound of male ego.  You travel halfway across the galaxy and
it's still the same song.
                -- Eve McHuron, "Mudd's Women", stardate 1330.1

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