I'm trying out 540, 1, 7 today.

Theory is that a new server will be force to take two tries, if they try in 5 minute intervals.

They have 1 hour to complete the retry otherwise they are off the limbo.

Once they do make it in, they are in the cache for 7 days and we start over again.

I've decided to try tightening security on greylisting as opposed to the other methods because of the accuracy that can be attained here. previous I was using dan's settings and reduced our database from 280,000 spam down to 13,000. Maybe this can make it better, maybe not, i'll know in a few days!

I just thought i'd share my settings and theory and see if anyone else has some others.

don't most servers wait 5 then 5 then 15 then 3 or 4 hours? In my mind a typical server will try once, and wait 5 minutes to try again, and then try again in 5 minutes. That kinda the norm. However i'm doing this as a test to see if it's anymore effective. So far I don't really think it is, I may move back to a 4 minute and 45 second rule and leave it for 8 hours.

so 285 8 7 is kinda what i'm leaning towards now. or even 260 8 7, I dunno.

hmmm, maybe the first time until you can send again should be set to 14 minutes maybe? I'm more concerned I think with the delay of email more than anything, mind you if you set it to 30 minutes and maybe kept the list for 14 days instead it's not that intrusive....

so maybe 1800 8 14 would be a good setting?

So what do you figure it optimal then?