1. touche! critical is good, i surely don't mind. i want the best solution possible. i appreciate the detail in which you have responded. (i also appreciate the delivery--it is often hard to have a critical technical discussion without making someone mad because of the faceless nature of the medium)
2. in looking at your points i cannot disagree. however, while i agree with you on the issues of danisch's proposal i still think that a workable solution can be derived from leveraging DNS with limited changes to SMTP (as i mentioned earlier). i am definitely NOT of the mind set that we should change the DNS specifications because if we go that route we might as well modify SMTP to handle a specific reliable authentication mechanism and be done with it.
i still stand by my proposal in *concept* because i think that it represents a way to knock down impersonation with a relatively minor modification to the SMTP spec (the 'callback' query). yeah, a spec change is a spec change, but if we could get *something* working amongst james servers it would (IMO): (a) add value to james users; (b) provide a de facto standard for how to do this; (c) generate some pub. as long as the capabilities are an extension optional (non-exclusive) to the procesing of SMTP messages, it seems like there are only positives in exploring the options *outside* of the current specifications.
maybe i am on crack, but the only standards that ever seem to get used are pretty much de facto standards (which includes all RFCs prior to the internet explosion in my book). james is a great platform and i would love to see it take on this issue, because specs the breadth of SMTP are constrained by commercial interests and that typically does not bode well for [meaningful] progress.
<eery sound>
mark my words, if an SMTP RFC modification ever comes out to 'solve' this it will bring with it an ill wind!
</eery>
b
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