On 6/18/2025 2:15 PM, Bron Gondwana wrote:
But also, did a lot of thinking about how to support multiple RCPT-TO
in a single SMTP transaction.
Bron, Hi.
Simple question: Why?
There was extensive discussion about multiple recipients here, on the
working group mailing list, where decisions are made for the working
group's woirk.
I am pretty sure my reading of that discussions is accurate, which
simplifies to: the number of cases that currently use multiple
recipients is vanishingly small, and so such support is not essential.
*Adding mechanisms that are intended to support vanishingly small
portions of cases -- and especially where that support only provides
efficiency rather than necessary functionality -- is pretty much always
a terrible idea for a global standard.*
It adds complexity to everyone's code, needs testing and ongoing
support, and gets excercised infrequently enough to make it likely that
it won't actually work when it is needed. That is, it is expensive and
fragile.
And then there is the small matter of working group rough consensus that
runs contrary to the pretty-clear rough consensus that I thought I saw
before, /against/ support for multiple addressees in a DKIM signature.
d/
--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
bluesky: @dcrocker.bsky.social
mast: @[email protected]
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