Shared mailboxes nightmare (for me :-( )

Felix Rubio Dalmau felix at
Mon Sep 26 21:31:55 UTC 2016

Hi everybody,

I am honestly desperate: I have spent/invested the whole day in trying to set a shared mailbox, with quite partial success. The INBOX is merged with the top level mailbox, and there are many more folders. To give an idea, for the shared account sharedacc at, this is how looks the folder structure:


in the account for usera at, I see the following:


So, I do not get to see folderA, folderB, folderC, etc.

My configuration is:

    # 2.2.25 (7be1766): /etc/dovecot/dovecot.conf
    # Pigeonhole version 0.4.14 (099a97c)
    # OS: Linux 4.5.4-0 x86_64 Debian stretch/sid zfs

    mail_plugins = zlib expire acl

    plugin {
    acl = vfile
    acl_shared_dict = proxy::acl

    dict {
    acl = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext

    namespace {
    list = children
    location = mdbox:/mnt/vmail/%%d/%%n:INDEXPVT=/mnt/vmail/indexes/shared/%%d/%%n
    prefix = shared/%%n/
    separator = /
    subscriptions = yes
    type = shared

    protocol lmtp {
    mail_plugins = zlib expire acl sieve

    protocol imap {
    mail_plugins = zlib expire acl antispam imap_acl

the files I have one the account for sharedacc are:
          |   \-dbox-Mails
          |       \-dovecot-acl
          |   \-dbox-Mails
          |       \-dovecot-acl

In dovecot-acl-list I have the following contents:
    1474920778 folderA
    1474920778 folderB
    1474920778 folderC

and in every dovecot-acl, I have:
    user=usera at  akxeilprwts

All the files on the filesystem are owned by the same vmail user.
What is strange is that I can see all these folderA, folderB, folderC in roundcube, and I can click to subscribe to them. However, when I go back to the general view, the subscriptions have been reset and I see only sharedacc, without a thing inside. Finally, in kmail I can see the subscribed folders without a problem (??!)

Can please somebody help me? 

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