[Asrg] greylisting, was Software bashing

[John Levine]

> Yes it is still pretty much effective, but should we wait for it to
> become less effective, or think of a better scheme or simply improve
> it?

In 2005 when I wrote my CEAS paper, 16% of greylisted IPs retried.
Now it's about 10%, which means that if anything, it works better than
ever.

Given that we don't have infinite resources, I see little reason to
spend more time on greylisting.

R's,
John