Hi,
I'm not sure that greylisting as described would add a lot to postfix address verification though. But it would be nice to try even just as an experiment to see how many of the 4% of spam was cut down by greylisting...
I don't use address verification with Postfix but I do use greylisting and it is ***VERY*** effective.
I would estimate that 98% of the spam and viruses that would hit my servers get prevented by using greylisting alone. Amavis cleans up the rest.
I do whitelist the major ISPs from my greylisting though so perhaps sender verification would help clean up those...
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