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Re: IETF SMTP Working Group Proposal at

  • From: Brad Knowles
  • Date: Wed Aug 21 19:40:38 2002

At 2:15 PM -0700 2002/08/21, <> wrote:

 Your quite wrong. With email we do in fact know "phone" for the calling
 party - its their FROM address and for callback we can specify if we trust
 or do not trust the other party to provide some different domain, so they
 may not be given a change to specify where to callback to. As example If
 they are trying to send email from <> the callback would
 have to go to mail server and the callback must use the
 authorization code given during initial mail call. The callback can also be
 authenticated with TLS giving even more security that is a
 real operation. This will prevent 99% of spammers just there.
It's bad enough waiting for DNS responses so that you can determine whether or not the envelope sender domain even exists. Now you want to slow down every single e-mail transaction by many, many, many orders of magnitude so that you can do a callback on each and every connection?!?

Man, wanna talk about ideas that would bring all e-mail to a complete stop across the entire Internet? Imagine what it would be like if AOL did this, so that it could take five, ten, or even fifteen minutes just to get one callback on one message, if the remote server was slow enough. Now, if you start up a sendmail queue runner every sixty minutes, you only need a very small number of messages in your queue before you start stacking up more and more and more sendmail processes, until such time as you run out of memory, your mail server crashes, and you might potentially lose all your queued e-mail.

Jeezus. Do you have to be the one guy who got blamed for shutting down all e-mail across the entire Internet on "Black Tuesday", just to see the flaws in this plan?!?

Brad Knowles, <>

"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
-Benjamin Franklin, Historical Review of Pennsylvania.

GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E W+++(--) N+ !w---
O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++)
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