Re: Open Issue: Splitting of local-part into labels and where?

Marc Mutz <[email protected]> schrieb/wrote:
> The question of whether or not to split the dequoted local-part into
> labels and if so, at which delimiter characters, remains unanswered in
> the -00 draft.

Well, in draft-faerber-i18n-email-netnews-names-00.txt I suggested this
list:

     SP / %x00-1F / "." / "@" / "+" / "%" / "=" / "/" / "," / ";" / ":"
     / "!" / "(" / ")" / "[" / "]" / "<" / ">"

     [[RATIONALE: As much delimiters as possible are used to increase
     the chance that the encoding of individual parts of the identifier
     are encoded the same way when included in other identifiers:
     "@" - used to separate local-part and domain name.
     "+" - used by some mailers for subaddressing
     "%" - used by some MTAs to embed domains within the local-part of
           email addresses ("percent-hack")
     "=" - used within MIXER (RFC 2156)
     "/" - used wihtin MIXER (RFC 2156), used as a newsgroup component
           separator in some leagacy non-RFC BBS networks.
     ",", ";" - used to separate identifiers in many positions
     ":" - used to seperate (obsolete) source routes from the
           destination address
     " " - used to separate source routes from each other.
     "!" - used as a separator within the Path header in RFC 1036,
           used as a address separator within (obsolete) UUCP bang
           addresses
     "(", ")" - used for comments, used within the replacement for some
           seperators according to MIXER (e.g. "(a)" instead of "@")
     "[", "]", "<", ">" - as precaution     ]]

And all Unicode characters that have a compatibility mapping to one of
those, of course.

We might want to add control characters - just in case they appear.

I'm not quite sure about the quoting characters ``"'' and ``\''. If we  
apply toASCII/toUnicode after dequoting the local part, there's no  
reason to include them. If we keep some quotes (canonicalised to the  
minimal quoted version), we should probably include them.

Claus
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