[Dovecot] Undeserved permissions error with g+s folder permissions

[Timo Sirainen]

On Sat, 2012-12-01 at 10:59 -0500, tlhackque wrote:
> I have a (mbox/IMAP) directory under my mail directory with these 
> permissions:
> 
> drwxrws--- 4 tlhackque mail 4096 Dec  1 10:34 Vendors/
> 
> It contains a subdirectory:
> 
> -rw-rw---- 1 thlackque mail 84805345 Dec  1 10:34 Vendors/AVendor
> 
> If I try to rename the AVendor folder (client is Thunderbird 17.0), I 
> get this error:
> 
>      Unable to rename across conflicting directory permisssions
> 
> If I chmod g-s Vendors, the RENAME command succeeds.

Where are you renaming it to and what permissions that directory has? I
can't seem to easily reproduce this.