Experiment with UTF-8 in message-IDs
Julien ÉLIE <julien@trigofacile.com> Sun, 09 October 2011 19:28 UTC
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Date: Sun, 09 Oct 2011 21:27:16 +0200
From: Julien ÉLIE <julien@trigofacile.com>
Organization: TrigoFACILE -- http://www.trigofacile.com/
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Subject: Experiment with UTF-8 in message-IDs
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Hi all,
In the IETF working group for IMA (Internationalized eMail Address),
there is a current thread about UTF-8 in message-IDs:
http://www.ietf.org/mail-archive/web/ima/current/threads.html#04330
Quick references in the thread:
http://www.ietf.org/mail-archive/web/ima/current/msg04430.html
http://www.ietf.org/mail-archive/web/ima/current/msg04344.html
http://www.ietf.org/mail-archive/web/ima/current/msg04345.html
http://www.ietf.org/mail-archive/web/ima/current/msg04420.html
http://www.ietf.org/mail-archive/web/ima/current/msg04422.html
RFC 5536 (USEFOR) currently allows only ASCII characters in message-IDs.
INN 2.4 and INN 2.5 have always rejected message-IDs containing
non-ASCII chars. (I have not looked at INN 2.3 and before.) When
a message-ID is not valid per RFC 850/1036/... and now 5536, the
article is rejected.
200 news.trigofacile.com InterNetNews server INN 2.6.0 (20110908 prerelease) ready (transit mode)
IHAVE <©@fr>
435 Syntax error in message-ID
MODE READER
200 news.trigofacile.com InterNetNews NNRP server INN 2.6.0 (20111003 prerelease) ready (posting ok)
ARTICLE <©@test>
501 Syntax error in message-ID
QUIT
205 Bye!
(Note that 435 is answered to IHAVE for legacy reasons; 501 should be
the real response code per RFC 3977.)
My question is: should we try right now to relax the check so as to allow
UTF-8 in message-IDs?
If yes, is there something else to enforce? (NFC normalization?)
Of course, other requirements from RFC 5536 will remain (that is to say
no comments in the Message-ID: header field, and no ">" or WSP).
U+00A0 ( in HTML) and other spaces encoded in UTF-8 are allowed,
aren't they?
We plan on releasing INN 2.5.3 soon, so perhaps we can relax the check
starting from INN 2.5.3. I will ask in the INN workers mailing-list,
if naturally there is no complaints in this USEFOR mailing-list against
going this way.
--
Julien ÉLIE
« I don't know if it's what you want, but it's what you get. »
(Larry Wall)
- Experiment with UTF-8 in message-IDs Julien ÉLIE
- Re: Experiment with UTF-8 in message-IDs Charles Lindsey