Statistics for Greylisting

Dec 27, 2020
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I am testing greylisting and wanted to know its statistics - is there a method for me to obtain something about Greylisting such as how many greylisted emails actually gets delivered or how many emails are greylisted? Really I wanted to measure the effectiveness of greylisting.

Maybe I am looking at the wrong places, however under statistics under greylisted emails it is constantly zero (0)?
 
I guess the statistics starts to show after 2 days has past (ie. I can see the stats from 3 days ago).

Can someone advise the meaning of that number for Greylisting:
1629116253869.png

Does that mean:
  1. 11% of emails were Greylisted and accepted; or
  2. 11% of emails were Greylisted and never returned; or
  3. 11% of emails were Greylisted counting both accepted and never returned
 

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