I should mention briefly that my suggested "VIA" ESMTP extension can not be
implemented exactly as I have presented it in earlier postings, due to syntax
constraints. The production for "esmtp-value" does not allow the "space" or
"=" characters, but the production for "mailbox" does. RFC 3461 faces the
same problem and uses a simple encoding it calls "xtext".
The protocol is still theoretically implementable, but it would be somewhat
uglier than my examples suggest if the esmtp-parameter mechanism were used.
Such is life. It's intended to be one idea in a pool of suggestions rather
than an immediate course of action in any case.
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