On Mon, 12 Nov 2007, Douglas Otis wrote: > > When the SMTP client's reputation is unknown, an SMTP server is unlikely > to Perm Error at the EHLO. Temp Errors at this point might be used to > discern whether the SMTP client keeps state, as with greylisting. Temp > errors might also be used to delay acceptance when a spam campaign is > detected as being active at an SMTP client handling messages from both > good and bad actors. TBR provides a safe alternative to greylisting and > temporary holds.
I agree that it is a worthwhile goal to reduce the interop problems of greylisting, and I agree that delaying email from unknown sources might give blacklists time to make a decision about the source. However, I believe that in doubtful cases it's better to apply AI to the complete message data than to attempt to analyse some abbreviated notification. In most cases MTAs have enough capacity to do this: at the moment (according to my stats) doubtful cases are about 30% of the email that gets past blacklists. I think it would be more useful for you to try to fix greylisting than to redesign IM2000 yet again. Tony. -- f.a.n.finch <[EMAIL PROTECTED]> http://dotat.at/ DOVER WIGHT: WEST 5 OR 6 VEERING NORTH OR NORTHWEST 5 TO 7, PERHAPS GALE 8 LATER. SLIGHT OR MODERATE, BECOMING ROUGH FOR A TIME. SQUALLY SHOWERS. GOOD.
