I'm about half way through the audio session and just finished the rationale for a single rcpt-to. I'd like to turn that rationale on it's head: if this is pretty much the way the world operates now (which I have no reason to doubt), why are we going out of our way to codify it with as a protocol level MUST? If this is such an edge case, why should DKIM care? From the session it seems that the (only?) rationale is "it's simpler". Simpler for whom though? It doesn't seem simpler for ESP since they already do a single rcpt-to or most other use cases beyond the mailing lists that still batch things together.
The reason I keep harping on this is that I don't understand the value of picking fights that need not be picked, cf the advice in 5321 that Barry brought up. I doubt I will be the only person who reads this and have alarm bells going off about changing the email architecture, and why it's necessary. So if it's really such a marginal problem why are we spending a lot of time requiring a change that doesn't seem like it needs to be mandated?
Mike
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