On Sun, 29 Jul 2007, Pete Resnick wrote:
My main issue here is that we already have examples where limiting the
syntax in "obvious" ways in 2822 screwed up 2821 (e.g., "Received:"
syntax) and I'd prefer not to shoot myself in the foot again. Do we know
of implementations (especially non-netnews implementations) which can't
deal with quoted-pair in domain literals or message ids, or won't strip
whitespace out of domain literals? Should this really come out?
821 is much stricter about the syntax of domain literals than 822, so an
SMTP agent that doesn't look at the message data can reasonably decline to
handle quoted pairs in domain literals.
Exim goes a bit further and does not support domain literals at all unless
you turn the feature on. Even then it only supports 821-style strict
syntax (plus IPv4: and IPv6 tagged address literals), without space or
quotes.
Tony.
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