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Re: [Asrg] draft-duan-smtp-receiver-driven-00.txt (DMTP/DiffMail)

2005-05-06 11:44:58

Given the initial crosspost, I'm doing the same (though they may be rejected) and suggesting all follow-up go to one list, only. I suggest asrg.

Yes, this is ~= IM2000, but with an improvement: it's potentially sometimes backward-compatible with SMTP. Generally, this draft (which I'll refer to as DMTP or DiffMail) has features (the draft lists 3 advantages*) that, IMO, are better provided by other systems.
Addressing them in reverse order:
3)This is better provided by greylisting+. That forces the sender to maintain something like a real mail queue. 2)Standard use of DNSRBLs (and sometimes RHSBLs with CSV or SPF) reduces bandwidth and storage costs more effectively and is compatible with all senders and most receivers today, with no code changes, and generally require just trivial configuration changes. 1)Again, greylisting allows a receiver a window of opportunity to allow the sender to get on a BL (or the message to enter a razor2 type DB) before receiving the message. It is true, however, that DMTP does provide a potentially larger window, and does so without indroducing a significant delay. The question is, is this worth the cost of requiring senders and receivers support new commands and a new reply code?

Confused by acronyms? See
for elucidation.

+See <>

*Purported Advantages:
"1. By asking senders (non-regular contacts) to maintain messages on their mail servers, spammers are forced to keep their servers up. They cannot simply send a large number of spam messages, shut down their servers, and switch to another domain (and/or change IP addresses). In this way, DiffMail helps to improve the effectiveness of IP-address-based filtering schemes. 2. Since a (complete) message is only retrieved by a receiver at his will, less bandwidth and storage resource will be consumed at the receiver side if the user does not retrieve the majority of messages from non-regular contacts. 3. Spammers now have more responsibilities to maintain their outgoing messages[.]"

On 5/5/05 3:51 PM, Kartik Gopalan sent forth electrons to convey: