Re: WHY we need do "Divide the sequence into segments"
John C Klensin <john-ietf <at> jck.com>
2004-06-04 13:01:23 GMT
--On Friday, 04 June, 2004 17:15 +0800 dongxiaoli
<dongxiaoli <at> cnnic.cn> wrote:
> Hello everyone.
> Have anybody can tell me WHY we need do "*Divide the
> sequence into segments*" in the ToASCII process as described
> in the
> IMAA draft (draft-hofmann-imaa-03.txt)??
In many circumstances, there is a good deal of information that
is already encoded into email local-parts. The most common of
these, these days, are subaddresses and internal routing codes,
but external routing and address component identification, such
as those used for X.400 addresses and fax-like attribute
identification when those are mapped to the Internet, have been
common (and probably still are) in some communities.
In many of those cases, the presence of the encoding and its
components must be recognized by the delivery MTA or, at the
boundary of an outright violation of the standards (however
necessary) by organizational-boundary relays such as
SMTP-handling firewalls. If the clues that the codings are
present are hidden by the i18n encoding, we gain
internationalization at the cost of the features supported by
We have no standard for any of those information encodings --
they have, so far, been protected by an extremely strong rule