dovecot - Apr 2011 - Encoding dovecot keywords

Hello.

If mailbox name include non latin chars, dovecot save it encode to
modification UTF-7. Example "????" convert to
"&BEIENQQ6BEEEQg-". If
replace & to + I can decode it:

<?php
$str = '+BEIENQQ6BEEEQg-';
echo iconv('UTF-7', 'UTF-8', $str);
?>


But I can't understand what encoding use dovecot for keywords? I set
"????" (number 5) keyword:

cat dovecot-keywords
0 &bcienqrbbeiepgqybdaetw-_&bdwenqrcbdoema-
1 test
2 $label1
3 $label2
4 $label3
5 &beienqq6beeeqg-

but "&beienqq6beeeqg-" do not convert to "????". Why?

Quoting ??????? ???????? <public-mail at alekciy.ru>:
> But I can't understand what encoding use dovecot for keywords? I set
> "????" (number 5) keyword:
>
> cat dovecot-keywords
> 0 &bcienqrbbeiepgqybdaetw-_&bdwenqrcbdoema-
> 1 test
> 2 $label1
> 3 $label2
> 4 $label3
> 5 &beienqq6beeeqg-
>
> but "&beienqq6beeeqg-" do not convert to "????".
Why?
Because only mailboxes are encoded in Modified UTF-7.  There is no  
equivalent encoding for keywords.  Keywords are *not* meant to be  
directly viewable by an end-user.  Converting between a keyword and  
the representation displayed to the user is the job of the MUA.

michael