Sieve: UTF-7 changes in 2.3.12p2?

[Frank Richter]

Hi,
we recently upgraded to cyrus-imapd-2.3.12p2 (Simon's RPM 2.3.12p2-2).

We've detected a problem with Sieve fileinto for folder names containing 
umlauts. The Sieve script is generated by Horde's Ingo module:
  # Delivery to subfolder töster (t-umlaut o-ster):
  if header :comparator "i;ascii-casemap" :contains "Subject" "ZZZ"  {
     fileinto "INBOX.t&APY-ster";
  }

Delivering with lmtp shows this:
Sep 23 11:16:40 augustus lmtp[23801]: autosievefolder: autosieve_subfolder() was called for user fri, folder user.fri.t&-APY-ster
Sep 23 11:16:40 augustus lmtp[23801]: sieve runtime error for fri id <alpine.LRH.2.00.0809231116290.14980 at angerer.hrz.tu-chemnitz.de>: Fileinto: Mailbox does not exist
Sep 23 11:16:40 augustus lmtp[23801]: duplicate_check: <alpine.LRH.2.00.0809231116290.14980 at angerer.hrz.tu-chemnitz.de> user.fri 0
Sep 23 11:16:40 augustus lmtp[23801]: duplicate_check: <alpine.LRH.2.00.0809231116290.14980 at angerer.hrz.tu-chemnitz.de> user.fri 0
Sep 23 11:16:40 augustus lmtp[23801]: Delivered: <alpine.LRH.2.00.0809231116290.14980 at angerer.hrz.tu-chemnitz.de> to mailbox: user.fri

The mail is delivered to the INBOX (user.fri)
The delivery is tried to user.fri.t&-APY-ster, NOT user.fri.t&APY-ster

Any hints where the error occurs?

Kind Regards,
Frank
-- 
E-Mail: Frank.Richter at hrz.tu-chemnitz.de  http://www.tu-chemnitz.de/~fri/
Work:   Computing Services,  Chemnitz University of Technology,  Germany