[Exim] mail throughput stats?

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Is there any way to work out the actualy mail throughput over time? Its just
so i can see the difference with adding the

require verify = sender

and

require verify = sender/callout/callout_defer_ok

Thanks
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Dave Markham ( Internet Systems Engineer )
( Internal - 7241 4805
( External - 01782 794805
* David.Markham@???
Fujitsu Services,
Westfields House, West Avenue, Kidsgrove,
Stoke-On-Trent, ST7 1TL
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