Jacob Yocom-Piatt wrote: > i have seen a number of spammer outfits doing this: following > the RFC and retrying until the spam gets though and they're > whitelisted, then they're free to push crap through. any > thoughts on how to best combat this behavior besides > spamassassin + amavisd (i.e. wasting cpu cycles and bandwidth)?
Indeed, if everyone in the world would use greylisting the spammers would all adjust to the new filtering method. The end-result is that mail gets slower. Is this a bad thing? Not really since only the initial message gets delayed for 30 minutes. Does it hurt normal people? Nope! Real people are barely hindered by a mere 30 minute delay in the arrival of an emailmessage, since they usually send only a few a day and no urgent reply is required most of the time. Does it hit spammers? You bet it does! They depend on fast emailnetworks which gobble up their every message. If email traffic is slowed down by greylists the servers have the time of the world to verify if a message is spam or not. And if a mailserver sends spam or not. # Han
