David Phillips wrote: > I came across this today. The concept is similar to IM2000: > > http://www.betteremail.com/better2.htm > > -- > David Phillips <david <at> acz.org> > http://david.acz.org/ > Also see this: http://www.emsd.org/
On Wed, Jan 01, 2003 at 07:23:03PM -0500, Dan Melomedman wrote: > > Also see this: http://www.emsd.org/ This is an interesting one. I've read the white paper, but not anything else, so these criticisms are based on that and are probably incomplete and may even be erroneous: - EMSD uses a new UDP-based protocol to support reliable transmission of packets. The benefits of this over TCP are not clear to me, especially in light of the fact that TCP is well-understood and widespread by many applications; using ESRO exposes a mail system to bugs in a new underlying layer, which strikes me as suboptimal. The author claims that a reduction from 9 to 3 transmissions makes this an acceptable tradeoff. (SMTP with pipelining vs EMSD) However, if you compare QMTP vs EMSD, the number is now 5 vs 3. That doesn't sound worthwhile to me. Also, UDP-based protocols are generally a hassle for firewalls. - EMSD uses RPC. I hate debugging RPC based protocols, I hate trying to verify them, and I hate pushing them through firewalls. - EMSD uses ASN.1. The vulnerabilities of most ASN.1 parsers are well-known; I am willing to bet USD5 that another multi-parser flaw is found in the next year. ASN.1 goes against my feelings about protocols on the Net: they should be human-readable, human-writable, human-debuggable. Basically, if I needed a short-message delivery protocol with guarantees, I would look at QMTP, BEEP, RSS or a custom TCP-based protocol; if I didn't need guarantees of any sort, I would use a custom(Continue reading)
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