dovecot - Jun 2014 - IMAP copy fails because the mailbox size of user1 is exceeding the quota limit of user2??

Hi all,
I do have a mailbox-quota problem in dovecot 2.0.19 that is beond my
understanding.
Could someone pls. give me a hint.

	- user1 max. mailbox quota is set to 1GB, the current mailbox size of user1 is
15MB
	- user2 max. mailbox quota is set to 10MB, the current mailbox size of user1 is
10kB
	- user1 shares the folder 'shared_folder' to user2 with all rights
(read, write ...)
	- user2 has subscribed to 'shared_folder'

the problem:

    - user2 tries to move a mail (20kB) to the shared folder via telnet: ".
copy 1:1 shared/user1/shared_folder"
	- it fails with: "NO [OVERQUOTA] Quota exceeded (mailbox for user is
full)"
	- copying the same mail to a local folder of user2 works without problems.
	- After I raised the max. mailbox quota of user2 from 10MB to 16MB it was
possible to move the mail to the 'shared_folder' of user1.
	
It looks like the copy operation fails because the mailbox size of user1 is
exceeding the quota limit of user2!
Is this possible? Is this a bug? Do I have a configuration problem?

dovecot -n
# 2.0.19: /etc/dovecot/dovecot.conf
# OS: Linux 3.5.0-51-generic x86_64 Ubuntu 12.04.4 LTS ext4
auth_debug = yes
auth_debug_passwords = yes
auth_mechanisms = plain login
auth_verbose = yes
dict {
  sqldomainquota = mysql:/etc/dovecot/dovecot-sql-domain.conf
  sqluserquota = mysql:/etc/dovecot/dovecot-dict-sql-user.conf
}
first_valid_uid = 150
last_valid_uid = 150
mail_debug = yes
mail_gid = mail
mail_location = maildir:/var/vmail/%d/%n
mail_plugins = " quota quota acl"
mail_uid = vmail
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacati
on subaddress comparator-i;ascii-numeric relational regex imap4flags copy includ
e variables body enotify environment mailbox date ihave
namespace {
  inbox = yes
  location   prefix   separator = /
  type = private
}
namespace {
  list = children
  location =
maildir:/var/vmail/mydomain.de/%%n:CONTROL=/var/vmail/mydomain.de/%n/           
shared/%%n:INDEX=/var/vmail/mydomain.de/%n/shared/%%n
  prefix = shared/%%n/
  separator = /
  subscriptions = yes
  type = shared
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
passdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
plugin {
  acl = vfile
  acl_shared_dict = file:/var/lib/dovecot/shared-mailboxes.db
  quota = dict:User quota::proxy::sqluserquota
  quota_rule2 = shared:ignore
  sieve = ~/_dovecot_sieve
  sieve_dir = ~/sieve
}
postmaster_address = kontakt at mydomain.de
protocols = imap pop3 sieve
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener /var/spool/postfix/private/dovecot-auth {
    group = postfix
    mode = 0660
    user = postfix
  }
  unix_listener auth-userdb {
    group = mail
    mode = 0600
    user = vmail
  }
}
service dict {
  unix_listener dict {
    mode = 0600
    user = vmail
  }
}
ssl_cert = </etc/ssl/certs/dovecot.pem
ssl_cipher_list = ALL:!LOW:!SSLv2:ALL:!aNULL:!ADH:!eNULL:!EXP:RC4+RSA:+HIGH:+MED
IUM
ssl_key = </etc/ssl/private/dovecot.pem
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
userdb {
  args = /etc/dovecot/dovecot-sql.conf.ext
  driver = sql
}
protocol imap {
  imap_client_workarounds = delay-newmail
  mail_max_userip_connections = 10
  mail_plugins = " quota imap_quota imap_quota acl imap_acl"
}
protocol pop3 {
  mail_max_userip_connections = 10
  pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
}
protocol lda {
  deliver_log_format = msgid=%m: %$
  mail_plugins = acl
  postmaster_address = postmaster
  quota_full_tempfail = yes
  rejection_reason = Your message to <%t> was automatically rejected:%n%r
}

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Wed, 4 Jun 2014, Katja Wegner wrote:
> Date: Wed, 4 Jun 2014 16:21:04 +0200
> From: Katja Wegner <katja.wegner92@web.de>
> To: dovecot@dovecot.org
> Subject: [Dovecot] IMAP copy fails because the mailbox size of user1 is
>     exceeding the quota limit of user2??
> 
> Hi all,
> I do have a mailbox-quota problem in dovecot 2.0.19 that is beond my
understanding.
> Could someone pls. give me a hint.
>
> 	- user1 max. mailbox quota is set to 1GB, the current mailbox size of
user1 is 15MB
> 	- user2 max. mailbox quota is set to 10MB, the current mailbox size of
user1 is 10kB
> 	- user1 shares the folder 'shared_folder' to user2 with all rights
(read, write ...)
> 	- user2 has subscribed to 'shared_folder'
>
> the problem:
>
>    - user2 tries to move a mail (20kB) to the shared folder via telnet:
". copy 1:1 shared/user1/shared_folder"
> 	- it fails with: "NO [OVERQUOTA] Quota exceeded (mailbox for user is
full)"
> 	- copying the same mail to a local folder of user2 works without problems.
> 	- After I raised the max. mailbox quota of user2 from 10MB to 16MB it was
possible to move the mail to the 'shared_folder' of user1.
See my message "quota using wrong limits in user shared mailboxes"
from 13
Mar 2014 10:59:23.

- -- 
Steffen Kaiser
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)

iQEVAwUBU5BUSHz1H7kL/d9rAQKSZQf+I7e5kHxuxeEDA+doD5IIBcPtLA9y7Mso
Xtky/+2iFU1A3j3TuhApYK7p9Pasuz8riQX+KM1ecdS73BIjcalfCgxVVZ5/I/55
/ycp9SlXdAA9qMsBFKH2pW9UQ2/MJ5Ddt1dpr8d4GgKk1AKjX/2oE4UbS/dZ8nI3
SzBZOVt336gH3mFwLTubAJYXFscxc6e02cavi7Jaovf4mucc0o+KSfXOgPV0W708
B+uHs1ZyzCbNDxtsmjuj2AZnbdhF8sdnRESQAU12suBIDbfEgFCH+74uWK+PICG/
Jxghgye5nS3GH2rHU4qftib8suNBKkMgR2Q+9KCbX3RHgUd5s3Dq8w==tQ0j
-----END PGP SIGNATURE-----

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Wed, 4 Jun 2014, Katja Wegner wrote:
> Date: Wed, 4 Jun 2014 16:21:04 +0200
> From: Katja Wegner <katja.wegner92 at web.de>
> To: dovecot at dovecot.org
> Subject: [Dovecot] IMAP copy fails because the mailbox size of user1 is
>     exceeding the quota limit of user2??
> 
> Hi all,
> I do have a mailbox-quota problem in dovecot 2.0.19 that is beond my
understanding.
> Could someone pls. give me a hint.
>
> 	- user1 max. mailbox quota is set to 1GB, the current mailbox size of
user1 is 15MB
> 	- user2 max. mailbox quota is set to 10MB, the current mailbox size of
user1 is 10kB
> 	- user1 shares the folder 'shared_folder' to user2 with all rights
(read, write ...)
> 	- user2 has subscribed to 'shared_folder'
>
> the problem:
>
>    - user2 tries to move a mail (20kB) to the shared folder via telnet:
". copy 1:1 shared/user1/shared_folder"
> 	- it fails with: "NO [OVERQUOTA] Quota exceeded (mailbox for user is
full)"
> 	- copying the same mail to a local folder of user2 works without problems.
> 	- After I raised the max. mailbox quota of user2 from 10MB to 16MB it was
possible to move the mail to the 'shared_folder' of user1.
See my message "quota using wrong limits in user shared mailboxes"
from 13
Mar 2014 10:59:23.

- -- 
Steffen Kaiser
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)

iQEVAwUBU5BUSHz1H7kL/d9rAQKSZQf+I7e5kHxuxeEDA+doD5IIBcPtLA9y7Mso
Xtky/+2iFU1A3j3TuhApYK7p9Pasuz8riQX+KM1ecdS73BIjcalfCgxVVZ5/I/55
/ycp9SlXdAA9qMsBFKH2pW9UQ2/MJ5Ddt1dpr8d4GgKk1AKjX/2oE4UbS/dZ8nI3
SzBZOVt336gH3mFwLTubAJYXFscxc6e02cavi7Jaovf4mucc0o+KSfXOgPV0W708
B+uHs1ZyzCbNDxtsmjuj2AZnbdhF8sdnRESQAU12suBIDbfEgFCH+74uWK+PICG/
Jxghgye5nS3GH2rHU4qftib8suNBKkMgR2Q+9KCbX3RHgUd5s3Dq8w==tQ0j
-----END PGP SIGNATURE-----

> See my message "quota using wrong limits in user shared
mailboxes" from 13
> Mar 2014 10:59:23.
Thank's for your answer Steffen. So I can confirm that I've the same
problem as you. Could you find a solution to that? I still hope that this is a
simple configuration problem, as I can't imagine, that we've been the
first to experience that strange behavior that for me, is part of the core
functionality of dovecot.