Unable to change password in roundcubemail

[Timotheus Pokorra]

> It works fine for me with users in the primary domain.
> For users in any additional domain, it fails for me too.
> I compared the ACLs, and I noticed that the dn:
> ou=People,dc=example2,dc=net has no acl section, compared to the
> primary domain.
That was the wrong idea. It seems to be something about mailquota again. 
The user obviously should not change it, but it is somehow modified:

LDAP: C: Mod-Delete 
uid=user20131213154417,ou=People,dc=domain20131213154411,dc=de: 
{"mailquota":["0"]}
LDAP: S: Insufficient access

Timotheus