On Fri, 2005-06-17 at 10:45 +0900, Miles Bader wrote: > Wouter Verhelst <[EMAIL PROTECTED]> writes: > > What's painful about it? > > > > It stops a lot of viruses and spam, with no false positives. What's the > > problem? > > "No false positives" seems a bit optimistic. > > One problem I've encountered in the past is big mail providers (like > yahoo) who will send retries from _different_ servers, which sometimes > don't even have a DNS entry (maybge it's just DNS propagation delay, I > don't know). > > How do greylisting services determine that a message is being resent > (and so should be accepted this time)? If it's by hostname or host > address, this would sometimes fail with systems like the above. >
I've had pretty good luck by matching by /24. The mail servers will usually be within that range. This has worked for the mail I host in terms of receiving from yahoo, ebay, hotmail, etc, etc Realistically, it's not a solution to spam, but it does at least cut down on what you get a fair bit. Pasc -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]