[exim] Benchmarking an MTA?

Hello,

… thinking about Exims performance …

Does anybody know anything about benchmarking an MTA?
What do we count as performance?

e.g.:
visible by the user:        time, a message spent in the queue
visible by the admin:       (spooled messages)/time the MTA can send
visible by the sending mta: messages/time the MTA can accept¹

Any other suggestions?

Would anybody be willing to share performance stats?
(In a first step: submit the results from a tailored eximstats output?)

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