Cannot move (delete) messages from/to different backends

[srss-sys at unisi.it]

Hi,
we upgraded Cyrus from 2.4.17 to 2.5.11, compiling sources on Debian 8.

Our configuration use murder (2 frontends, 3 backends).

After upgrade, it's impossible move messages between shared mailboxes on 
different backends.
No errors, only copy!

If on different backends, log shows:

> . uid move 9 Trash
> . OK [COPYUID 1433926880 99] Completed

Same backend:

> . uid move 9 Trash
> * 1 EXPUNGE
> . OK [COPYUID 1433926880 9 105] Completed

It seems the same issue as in #51 on gitHub: 
https://github.com/cyrusimap/cyrus-imapd/issues/51

There is a way to solve?  Upgrade to Cyrus 3.0?  Patches?

Thanks a lot,
Marco.


-- 
Marco Chesi
Ufficio Esercizio e Tecnologie
Area Organizzazione e Sistemi Informativi
Università degli Studi di Siena
Via S. Bandini, 25 - 53100 Siena
E-mail: marco.chesi at unisi.it
Tel 0577 235020 - Fax 0577 232383