Re: [Asrg] [ASRG] SMTP pull anyone?
Daniel Feenberg <feenberg@nber.org> Fri, 28 August 2009 11:46 UTC
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Date: Fri, 28 Aug 2009 07:38:54 -0400
From: Daniel Feenberg <feenberg@nber.org>
To: Anti-Spam Research Group - IRTF <asrg@irtf.org>
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Subject: Re: [Asrg] [ASRG] SMTP pull anyone?
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Tim Chown wrote: >Based on our stats from June, we received an average of 158,000 messages >per day over IPv4 transport, of which 81% were deemed spam, while we >received 438 (yes, 438!) messages via per day IPv6, of which 32% were >spam. So even for us, v6 is less than 1% of all received mail. The relevant percentage would be the spam percentage coming from hosts that have no IPv4 address. The quality of dual-stacked hosts is not really germane to the question of whether IPv6 only hosts will ever exist. I don't doubt that many MTAs will accept IPv6 mail. What I dispute is the liklihood of anyone running a legitimate Internet MTA that accepts mail from an IPv6 only host. My reasoning is that such a host would have limited connectivity. There are two reasons for this. (1) Many MTA operators will lag in the adoption of IPv6 due to general lack of interest, ability or funds, so an IPv6 only MTA will have no access to many MTAs, much worse even than MTAs operating at dial-up addresses currently have. (2) Anyone operating an MTA on IPv6 will have to do without the single most effective anti-spam technique we have, the DNSBL. This will cause many operators with the resources to add IPv6 to hesitate to do so. Given either of these two reasons, few or no MTAs will run IPv6 only, which obviates the need for IPv6 entirely. Of course, some operators can do without DNSBLs, and they can easily operate dual-stack. There is no practical way they can drop IPv4, nor will they ever be able to do so. So, how much mail came from IPv6-only hosts? And what was the percentage of spam? Daniel Feenberg
- Re: [Asrg] SMTP pull anyone? John Levine
- Re: [Asrg] [ASRG] SMTP pull anyone? John Levine
- Re: [Asrg] [ASRG] SMTP pull anyone? Steve Atkins
- [Asrg] SMTP pull anyone? Ravi shankar
- Re: [Asrg] SMTP pull anyone? Bill Cole
- Re: [Asrg] SMTP pull anyone? mathew
- Re: [Asrg] SMTP pull anyone? Dave CROCKER
- Re: [Asrg] SMTP pull anyone? John Levine
- [Asrg] [ASRG] SMTP pull anyone? Ravi shankar
- Re: [Asrg] SMTP pull anyone? Ian Eiloart
- Re: [Asrg] [ASRG] SMTP pull anyone? John Levine
- Re: [Asrg] [ASRG] SMTP pull anyone? Rich Kulawiec
- Re: [Asrg] [ASRG] SMTP pull anyone? Douglas Otis
- Re: [Asrg] SMTP pull anyone? Michael Thomas
- Re: [Asrg] SMTP pull anyone? Douglas Otis
- Re: [Asrg] [ASRG] SMTP pull anyone? Ravi shankar
- Re: [Asrg] [ASRG] SMTP pull anyone? Rich Kulawiec
- Re: [Asrg] [ASRG] SMTP pull anyone? Alessandro Vesely
- Re: [Asrg] SMTP pull anyone? Alessandro Vesely
- Re: [Asrg] SMTP pull anyone? Dave CROCKER
- Re: [Asrg] [ASRG] SMTP pull anyone? Bill Cole
- Re: [Asrg] SMTP pull anyone? Bart Schaefer
- Re: [Asrg] [ASRG] SMTP pull anyone? Douglas Otis
- Re: [Asrg] [ASRG] SMTP pull anyone? Chris Lewis
- Re: [Asrg] [ASRG] SMTP pull anyone? Dave CROCKER
- Re: [Asrg] [ASRG] SMTP pull anyone? Douglas Otis
- Re: [Asrg] [ASRG] SMTP pull anyone? Chris Lewis
- Re: [Asrg] [ASRG] SMTP pull anyone? Jeff Macdonald
- Re: [Asrg] [ASRG] SMTP pull anyone? John Levine
- Re: [Asrg] [ASRG] SMTP pull anyone? Douglas Otis
- Re: [Asrg] [ASRG] SMTP pull anyone? Daniel Feenberg
- Re: [Asrg] [ASRG] SMTP pull anyone? Graeme Fowler
- Re: [Asrg] [ASRG] SMTP pull anyone? Rich Kulawiec
- Re: [Asrg] [ASRG] SMTP pull anyone? Jeff Macdonald
- Re: [Asrg] [ASRG] SMTP pull anyone? Steve Atkins
- Re: [Asrg] [ASRG] SMTP pull anyone? Chris Lewis
- Re: [Asrg] [ASRG] SMTP pull anyone? Alessandro Vesely
- Re: [Asrg] [ASRG] SMTP pull anyone? Tim Chown
- Re: [Asrg] [ASRG] SMTP pull anyone? Rich Kulawiec
- Re: [Asrg] [ASRG] SMTP pull anyone? Douglas Otis
- Re: [Asrg] [ASRG] SMTP pull anyone? Daniel Feenberg
- Re: [Asrg] [ASRG] SMTP pull anyone? Douglas Otis