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

1 Dec 2012


      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.
I shouldn't have to do this...
Version and configuration information:
dovecot --version
2.1.10
# OS: Linux 2.6.22.14-72.fc6 i686 Fedora Core release 6 (Zod)
first_valid_gid = 4000
first_valid_uid = 4000
hostname = example.net
login_greeting = Dovecot ready.  Unauthorized access is prohibited.
mail_access_groups = mail
mail_location = mbox:~/mail:INBOX=/var/mail/%n
mail_privileged_group = mail
namespace inbox {
inbox = yes
location =
mailbox Drafts {
special_use = \Drafts
}
mailbox Junk {
special_use = \Junk
}
mailbox Sent {
special_use = \Sent
}
mailbox "Sent Messages" {
special_use = \Sent
}
mailbox Trash {
special_use = \Trash
}
prefix =
separator = /
}
passdb {
driver = pam
}
plugin {
autocreate = Trash
autocreate2 = Train As Spam
autocreate3 = Train As Ham
autocreate4 = Train As Forgotten
autosubscribe = Trash
autosubscribe2 = Train As Spam
autosubscribe3 = Train As Ham
autosubscribe4 = Train As Forgotten
}
service imap-login {
inet_listener imap {
address = imap.v4.example.net imap.v6.example.net
port = 143
}
inet_listener imaps {
address = imap.v4.example.net imap.v6.example.net
port = 993
ssl = yes
}
}
service pop3-login {
inet_listener pop3 {
address = pop.v4.example.net pop.v6.example.net
port = 110
}
inet_listener pop3s {
address = pop.v4.example.net pop.v6.example.net
port = 995
ssl = yes
}
}
ssl_ca = 
--
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if any, on the matters discussed.