Subject: [EAI] draft-ietf-eai-utf8headers-01.txt comment #2

From: Kari Hurtta <[email-masked]>
Date: Fri, 6 Oct 2006 19:18:54 +0300 (EEST)

This is perhaps already discussed to dead.

   angle-addr     =  [CFWS] "<" utf8-addr-spec [alt-address] ">" [CFWS]

   utf8-addr-spec =  utf8-local-part "@" utf8-domain

   utf8-local-part=  utf8-dot-atom / quoted-string / obs-local-part

   utf8-domain    =  utf8-dot-atom / domain-literal / obs-domain

   alt-address    =  "{" [CFWS] addr-spec [CFWS] "}"

Is that alt-address really necessary?

That have quite large impact.

It does not only require that MUAs need new parser.

That also affect to MTAs.  Usually MTAs provides way to
rewrite addresses on headers. That is often requirement
to border MTAs. 

These MTAs must also then change parser  (more that just 
passing utf-8 characters around.)

Downgrading also requires parser, but these alt-address 
syntaxes may cause that existing code can not be reused. 

/ Kari Hurtta

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