A paper from 2007 studies the performance of SMTP servers (Exim, Postfix, Sendmail, ...) and takes in consideration the anti-spam-measures. Could be an inspiration for further tests:
http://www.hawai.hu/doc/BencsathR07cts.pdf

Cheers,
Joachim


On 2016-02-05 10:18, Heiko Schlittermann wrote:
Klaus Ethgen <[email protected]> (Mi 03 Feb 2016 11:27:59 CET):
…
Unfortunately there is no real statistics about that available. It would
also be somehow hard as it depends on the internal processing. So
naturally the throughput would be lower when doing spam checking as it
would be without.

Yes, inbound probably is not comparable, as I suspect, the impact of
content scanning overrides everything.

But once we have the message in the queue, it should be delivered
*fast*. That Exim does normally, but if something breaks and the queue
fills up …

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann

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