On Wed, Mar 23, 2011 at 03:06:04PM -0700, Jeroen van Aart wrote:

> I am curious if postfix would be able to send out 300000 emails in one 
> hour, to different recipients of course. Taking into account 
> http://www.postfix.org/TUNING_README.html and other such performance tuning 
> guides. This would only happen once a week or so. The important part is the 
> need to send them all in one hour, more or less.

        $ echo 1k 300000 3600 / p | dc
        83.3

Postfix will easily handle 83 deliveries a second, provided that:

    - The disk subsystem is server-grade.

    - The network link can sustain the output bandwidth

    - The destination networks are not throttling your output or
      severely limiting your concurrency.

> Considering 300000 per hour equates to about 83 emails per second and given 
> a reasonably fast server (over specced since I doubt CPU and RAM would be 
> the bottleneck here) I would think one server could handle this.

A lot depends on where the mail is going and the concurrency limits and
delivery latencies of those destinations.

-- 
        Viktor.

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