I see some previous posts regarding this - just my 2 cents worth. There mig= ht be multiple triggers for the penalty time, but, one I'd like to see woul= d be just like postscreen_dnsbl_threshold, perhaps postscreen_dnsbl_penalty= _threshold. In this way, I might want a score of 3 to trigger block, but, a= score of 1 to trigger the penalty time. Similar to what one can do with mi= lter-greylist for example.
Of course, one problem with using Postscreen in this manner is what some of= the greylisting programs have added support for - mail servers who send th= e second attempt from a different nearby IP. Most of them allow some sort o= f mask. One could whitelist them, and, get around this I suppose. Am just hoping postscreen will support some form of greylisting so that a s= eparate greylisting program is not needed for those who wish to greylist. P= ostscreen would be the best (least expensive) place to do so imho. Steve