[Asrg] Re: draft-duan-smtp-receiver-driven-00.txt
Tony Finch <dot@dotat.at> Mon, 09 May 2005 21:19 UTC
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Date: Mon, 09 May 2005 22:19:09 +0100
From: Tony Finch <dot@dotat.at>
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To: Kartik Gopalan <kartik.gopalan@gmail.com>
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Cc: dot@dotat.at, asrg@ietf.org, Yingfei Dong <yingfei@hawaii.edu>, lemonade@ietf.org, ietf-smtp@imc.org
Subject: [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt
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This draft is worthless. The fundamental idea that it shares with IM2000 is based on a mis-targeted optimisation. The main cost of spam is the human time it wastes, whereas disk space on the recipient servers is very cheap. In fact DMTP makes dealing with poorly-classified email MORE time-consuming than it is already, because a recipient must deal with a content-free notification (containing only a forged sender address and a message ID) as well as the actual message. If you enhance notification messages so that they are sufficiently informative for a recipient to be able to decide whether to retrieve the bulk message, then spammers will just put the entirety of their payload in the notification message. This has already occurred with certain kinds of mobile phone spam. When in doubt about the spamminess of a message it is better to receive the whole thing. This allows the full gamut of classification technology can be applied to it, so that there is a greater chance of it being classified before it wastes the time of a person. IM2000 and DMTP are also based on an incorrect assumption, that spam messages actually cost space on the senders disks. Most spam software is stateless, and it can continue to be in IM2000 or DMTP: the spammer just encodes enough information in the message ID in order to be able to reconstruct the message when it is requested. As well as being based on a fundamentally useless idea, the details of the specification are incompetent. It fails to use the SMTP extension model correctly. A client indicates that it wishes to use an extension by using a command from the extenstion or a MAIL or RCPT parameter, NOT by appending a keyword to its EHLO command. It shows a misunderstanding of the difference between the SMTP envelope and the message header. It has inexplicable colons in its command names, in contradiction to SMTP's requirement that commands are alphabetic. It makes assumptions about IP routeing which compromise the usability of DMTP with highly scaled MTA clusters, which often involve NAT and/or multi-homed servers. The attempt at cryptography in section 3.4 is laughable. Tony. -- f.a.n.finch <dot@dotat.at> http://dotat.at/ BISCAY: WEST 5 OR 6 BECOMING VARIABLE 3 OR 4. SHOWERS AT FIRST. MODERATE OR GOOD. _______________________________________________ Asrg mailing list Asrg@ietf.org https://www1.ietf.org/mailman/listinfo/asrg
- [Asrg] draft-duan-smtp-receiver-driven-00.txt Kartik Gopalan
- Re: [Asrg] draft-duan-smtp-receiver-driven-00.txt Jon Kyme
- Re: [Asrg] draft-duan-smtp-receiver-driven-00.txt… Matthew Elvey
- Re: [Asrg] draft-duan-smtp-receiver-driven-00.txt Kartik Gopalan
- Re: [Asrg] draft-duan-smtp-receiver-driven-00.txt Daniel Feenberg
- Re: [Asrg] draft-duan-smtp-receiver-driven-00.txt… Kartik Gopalan
- Re: [Asrg] draft-duan-smtp-receiver-driven-00.txt Kartik Gopalan
- Re: - Re: [Asrg] draft-duan-smtp-receiver-driven-… Zhenhai Duan
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt Tony Finch
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt Kartik Gopalan
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt Tony Finch
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt Kartik Gopalan
- [Asrg] Re: Re: draft-duan-smtp-receiver-driven-00… Zhenhai Duan
- [Asrg] Re: Re: draft-duan-smtp-receiver-driven-00… Tony Finch
- [Asrg] Re: Re: draft-duan-smtp-receiver-driven-00… Kartik Gopalan
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt Brett Watson
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt David hagel
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt David hagel
- [Asrg] Re: Re: Re: draft-duan-smtp-receiver-drive… Zhenhai Duan
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt Zhenhai Duan
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt David Hagel
- [Asrg] Re: draft-duan-smtp-receiver-driven-00.txt Frank Ellermann
- [Asrg] Early history and 2821 (was: draft-duan-sm… Frank Ellermann
- [Asrg] Re: Early history and 2821 Frank Ellermann
- [Asrg] Re: Early history and 2821 (was: draft-dua… Keith Moore