Re: [Asrg] An Anti-Spam Heuristic
Steve Atkins <steve@blighty.com> Thu, 13 December 2012 21:08 UTC
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From: Steve Atkins <steve@blighty.com>
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Date: Thu, 13 Dec 2012 13:08:03 -0800
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To: Anti-Spam Research Group - IRTF <asrg@irtf.org>
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Subject: Re: [Asrg] An Anti-Spam Heuristic
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On Dec 13, 2012, at 12:59 PM, Seth <sethb@panix.com> wrote: > Barry Shein <bzs@world.std.com> wrote: > >> There's also Jef Poskanzer's greymilter which basically requires one >> re-send from each never before seen mail server not in a white list. >> >> And sendmail (and others') HELO delay (delay sending HELO a short >> period of time) and don't speak until you're spoken to whatever they >> call it (I use it, the sender must wait for the SMTP responses, can't >> just dump an SMTP conversation at you.) >> >> They're basically isomorphic to hashcash type solutions, increase the >> sender's cost, but very transparent and quite clever because of that. > > They have nothing to do with increasing the sender's cost. Rather, > they take advantage of the fact that legitimate mailers implement the > RFCs in ways that spamware typically doesn't, so they test for that > and spamware flunks. And a lot of spamware doesn't flunk. Yet it can damage legitimate use of email, both when the senders aren't following RFCs strictly (lots of senders will give up if a recipients MX is so overloaded/broken that it's not responding after tens of seconds) or when they are (greylisting in particular really breaks active mailing lists, by reordering discussions into a fairly random order). It's the sort of thing that people tend to do because it makes them feel like they're sticking one to spammers - which isn't a bad reason, by any means, but doesn't lead towards optimal solutions. Cheers, Steve
- [Asrg] An Anti-Spam Heuristic Adam Sobieski
- Re: [Asrg] An Anti-Spam Heuristic Steve Atkins
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- Re: [Asrg] An Anti-Spam Heuristic Adam Sobieski
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- [Asrg] The Real Problem (was: An Anti-Spam Heuris… Andrew Sullivan
- Re: [Asrg] An Anti-Spam Heuristic Rich Kulawiec
- Re: [Asrg] An Anti-Spam Heuristic Bill Cole
- Re: [Asrg] An Anti-Spam Heuristic Bart Schaefer
- Re: [Asrg] The Real Problem Chris Lewis
- Re: [Asrg] The Real Problem Alessandro Vesely
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Michael Thomas
- Re: [Asrg] The Real Problem (was: An Anti-Spam He… Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic John Leslie
- Re: [Asrg] An Anti-Spam Heuristic Seth
- Re: [Asrg] An Anti-Spam Heuristic Steve Atkins
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Steve Atkins
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Barry Shein
- Re: [Asrg] An Anti-Spam Heuristic Michael Thomas
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- [Asrg] Countering Botnets to Reduce Spam Adam Sobieski
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Martijn Grooten
- Re: [Asrg] An Anti-Spam Heuristic Adam Sobieski
- Re: [Asrg] Countering Botnets to Reduce Spam Rich Kulawiec
- Re: [Asrg] Countering Botnets to Reduce Spam Adam Sobieski
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Rich Kulawiec
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- Re: [Asrg] An Anti-Spam Heuristic John Levine
- Re: [Asrg] Countering Botnets to Reduce Spam John Levine
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] Countering Botnets to Reduce Spam Barry Shein
- Re: [Asrg] Countering Botnets to Reduce Spam Chris Lewis
- Re: [Asrg] An Anti-Spam Heuristic Alessandro Vesely
- Re: [Asrg] An Anti-Spam Heuristic Chris Lewis