Dear all,

I'm configuring Dovecot 2.4.1 with per-user mailbox format support, but cannot get user shared mailbox working between different mailbox formats.

• Account mdbox@domain.com is a mdbox format mailbox, access with webmail is ok.
• Account maildir@domain.com is a maildir format mailbox, access with webmail is ok.
• mdbox@ shares its Sent folder to maildir@ with Roundcube webmail, grants all privileges (akxeilprwts).

The result is maildir@ cannot see the shared folder.

• No error reported in Dovecot log file.
• mysql logs the queries performed to get user shared mailbox, i ran the query manually and it returns correct result like this:

MariaDB [vmail]> SELECT dummy,from_user FROM share_folder WHERE to_user = 'maildir@domain.com' \G
*************************** 1. row ***************************
    dummy: 1
from_user: mdbox@domain.com

dovecot.conf snippet attached below. I think the "mail_*" parameters inside namespace shared {} block are incorrect to handle mixed mailbox formats because it hard-codes the mail_driver and mail_path, tried all possible parameters i can imagine, but failed.

Thanks for helping. :)

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mail_plugins { acl = yes ... }

protocol imap { mail_plugins { imap_acl = yes ... } ... }

mail_driver = %{userdb:mail_driver | default("maildir") | lower} mail_path = %{userdb:mail_path | default("~/Maildir")}

sql_driver = mysql mysql 127.0.0.1 { port = ... dbname = ... user = ... password = ... }

userdb sql { # ... omit other lines ... query = SELECT
LOWER('%{user | lower}') AS master_user,
LOWER(CONCAT(mailbox.storagebasedirectory, '/', mailbox.storagenode, '/', mailbox.maildir)) AS home,
mailbox.mailboxformat AS mail_driver,
CONCAT("~/", mailbox.mailboxfolder) AS mail_path,
CONCAT('*:bytes=', mailbox.quota*1048576) AS quota_rule
FROM ... }

namespace shared { type = shared separator = / prefix = Shared/$user/ subscriptions = yes list = children

mail_driver = maildir
mail_path = %{owner_home}/Maildir
mail_index_private_path = ~/Maildir/shared/%{owner_user}
# not share the index files between users
mail_index_path = ~/Maildir/shared/%{owner_user}

}

acl_driver = vfile acl_globals_only = no

acl_sharing_map { dict proxy { name = acl } }

dict_server { dict acl { driver = sql

    dict_map shared/shared-boxes/user/$to/$from {
        sql_table = share_folder
        value_field dummy {
        }

        key_field from_user {
            value = $from
        }
        key_field to_user {
            value = $to
        }
    }

    dict_map shared/shared-boxes/anyone/$from {
        sql_table = anyone_shares
        value_field dummy {
        }

        key_field from_user {
            value = $from
        }
    }
}

...

}

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