On 2006-01-22 19:40:09 -0000, John Levine wrote: > >I'm in no way a C/R supporter, but I have done some experiments with C/R > >in that past. One "enhancement" I quickly discovered was using VERP > >tagging on the challenges, and dropping messages from the pending queue > >when the challenge bounced. This cut the pending queue by more then 90%. > > Russ Nelson has experimented with a R (no C) technique based on this > observation. When a message from an unfamiliar address arrives, his > setup sends an auto-ack and puts the mail into a holding pen. If the > auto-ack bounces, he moves the message into the spam folder. If after > 15 minutes or so there's no bounce, the message moves into the inbox. > > He said it works quite well. However, it still sends mails to innocent bystanders. It is mitigated by the fact that each address only gets one mail, but if this is widely implemented, the owners of the forged sender addresses used by spammers will be bombarded with auto-ack messages. hp -- _ | Peter J. Holzer | Ich sehe nun ein, dass Computer wenig |_|_) | Sysadmin WSR | geeignet sind, um sich was zu merken. | | | hjp at hjp.at | __/ | http://www.hjp.at/ | -- Holger Lembke in dan-am
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