On Thu, 20 Nov 2014 14:35:50 -0600, Sam Clippinger wrote:
> An interesting statistic to look at, I think, would be the number of 
> connections blocked by graylisting that don't eventually return with 
> a successful delivery.

Les did a better job of calculating this (40% deliveries were never 
reattempted), but I think my total inbound message numbers, before and after 
greylisting, reflect roughly the same metric (i.e., half as many messages were 
accepted when using greylisting).

On this topic, I found this relevant serverfault.com question: 

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