On Wed, 24 Nov 2004, Aleksandar Milivojevic wrote: > I'm not particualry fond of gray-listing either. The amount of spam it > blocks isn't worth the delay in legitimate email exchange between two > individuals.
You can refine greylisting to minimize that as we do in our commercial CanIt product. Basically, we look at the sender address, recipient address, and first three octets of the IP address (to handle the "farm of sending machines" issue.) The crucial thing to minimize impact is that once a given machine retries, you remember this and never greylist for that machine for 30 days or so. This gives you all the benefits while greatly mitigating delays of legitimate e-mail. > There are cuople of filters floating around that implement gray-listing. > Theoretically, it should be possible to implement it directly in > mimedefang-filter, but don't know anybody that did that. I have sample code (not production-ready) in my LISA slides on the MIMEDefang site. -- David. _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [EMAIL PROTECTED] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
