[Dovecot] fchown() error with Public Folders

[Timo Sirainen]

On Mar 16, 2009, at 2:06 AM, Stephen Carville wrote:

>> Do you have dovecot-shared file in the .Incoming/ directory? Dovecot
>> tries to use that file's group. If you don't want it to do that,  
>> you can
>> chmod g+s dovecot-shared and it's not preserved.
>
> I have dovecot-shared in the directory.  The part that kept throwing
> me was that the user was a member if the group (cs).  I finally
> discovered that adding a user to the group must be accompanied by
> adding  userdb_system_user=username to the imap.passwd file.

Yes, if all your users are also system users. Another possibility  
would have been to set userdb_mail_access_groups=groupname. Or just  
change the primary gid to that group.