[horde] Cannot edit filter rules (ingo with timsieved)

[Sascha Schmidt]

  I've activated sieve as my filter backend. Everything works fine for my
user. Activating the "shares" option and giving the rights for a special
user to show, read, edit and delete rules does not really work...

If I try to edit the rules for another user (I can choose the ruleset of
this user) ingo tells me that I'm not allowed to edit the rules of this
user... Checking the permissions again I can see a hook at every
permission.

Any hints whats going wrong here? How does ingo auth against the sieve
daemon to change the ruleset of another user?
 

  Greets
Sascha