Shared mailboxes, index files and 'per-user-seen' flags

[Marco Giunta]

Hi Thomas,
it is a known problem:

  https://www.dovecot.org/pipermail/dovecot/2018-February/111057.html

Try the solution suggested in above mail; it works for me.

Thanks,
  Marco

On 2018-06-06 13:53, Thomas Robers wrote:
> Hello,
> 
> i have a dovecot server version 2.3.1 under CentOS 6.9 and we're
> using shared mailboxes with index files shared. With this configuration
> I can see a lot of error messages like:
> 
>    Jun  6 13:20:31 mail dovecot: Error: imap(userA at tutech.de)<4513>
>    <onjjWPdtDuLAqG3R>: /export/home/imap/userA at tutech.de/shared
>    /userB at tutech.de/folder/dovecot.index.pvt view is inconsistent
> 
> In 10-mail.conf the location setting is:
> 
>    location = maildir:%%h/Maildir:INDEXPVT=%h/shared/%%u
> 
> I thought setting the index files to "not shared" might help to
> get rid of the errors, so I changed the setting to:
> 
>    location = maildir:%%h/Maildir:INDEX=%h/shared/%%u:INDEXPVT=%h
>    /shared/%%u
> 
> like it's mentioned in the Dovecot wiki. But that doesn't work as
> I expected, because the 'per-user-seen' flags do not work correctly
> anymore, i think. If UserA, who has UserB as shared mailbox,
> changes the seen flags of UserBs INBOX, UserBs seen flags are also
> changed. The other way, if UserB changes seen flags in his INBOX
> they are not changed in the shared view of UserA. Is this the
> supposed way to work  or do i have an error in the configuration?
> 
> Any help is appreciated.
> 
> Thanks, Thomas.
> 
> Here's my currently used configuration:
> 
> # 2.3.1 (c5a5c0c82): /etc/dovecot/dovecot.conf
> # Pigeonhole version 0.5.devel (61b47828)
> # OS: Linux 2.6.32-696.23.1.el6.x86_64 x86_64 CentOS release 6.9 (Final)
> ext4
> # Hostname: mail.tutech.de
> auth_master_user_separator = *
> auth_mechanisms = plain login
> auth_verbose = yes
> disable_plaintext_auth = no
> doveadm_password =  # hidden, use -P to show it
> doveadm_port = 12345
> imap_max_line_length = 2 M
> mail_debug = yes
> mail_location = maildir:/export/home/imap/%Lu/Maildir
> mail_plugins = acl zlib mail_log notify
> mail_prefetch_count = 1
> mailbox_idle_check_interval = 10 secs
> managesieve_notify_capability = mailto
> managesieve_sieve_capability = fileinto reject envelope
> encoded-character vacation subaddress comparator-i;ascii-numeric
> relational regex imap4flags copy include variables body enotify
> environment mailbox date index ihave duplicate mime foreverypart
> extracttext
> namespace {
>   hidden = no
>   ignore_on_failure = no
>   inbox = no
>   list = children
>   location = maildir:%%h/Maildir:INDEXPVT=%h/shared/%%u
>   prefix = shared/%%u/
>   separator = /
>   subscriptions = yes
>   type = shared
> }
> namespace inbox {
>   hidden = no
>   inbox = yes
>   list = 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 = INBOX/
>   separator = /
>   type = private
> }
> 
> passdb {
>   args = /etc/dovecot/master-users
>   driver = passwd-file
>   master = yes
> }
> passdb {
>   args = /etc/dovecot/dovecot-ldap.conf.ext
>   driver = ldap
> }
> plugin {
>   acl = vfile:/etc/dovecot/global-acls:cache_secs=300
>   acl_shared_dict = file:/export/home/shared-db/shared-mailboxes
>   mail_log_events = append delete undelete expunge copy mailbox_delete
> mailbox_rename flag_change
>   mail_log_fields = uid box msgid size from flags
>   mail_replica = tcp:mail2.tutech.de
>   sieve = ~/.dovecot.sieve
>   sieve_dir = ~/sieve
>   sieve_global = /var/lib/dovecot/sieve/global/
>   sieve_user_log = ~/.dovecot.sieve.log
>   zlib_save = gz
>   zlib_save_level = 6
> }
> protocols = imap pop3 lmtp sieve sieve
> service aggregator {
>   fifo_listener replication-notify-fifo {
>     mode = 0666
>     user = vmail
>   }
>   unix_listener replication-notify {
>     mode = 0666
>     user = vmail
>   }
> }
> service auth {
>   unix_listener /var/spool/postfix/private/auth {
>     mode = 0666
>   }
>   unix_listener auth-userdb {
>     group = vmail
>     mode = 0660
>     user = vmail
>   }
> }
> service config {
>   unix_listener config {
>     user = vmail
>   }
> }
> service doveadm {
>   inet_listener {
>     port = 12345
>   }
>   user = vmail
> }
> service imap-login {
>   inet_listener imaps {
>     port = 993
>     ssl = yes
>   }
>   process_limit = 500
>   process_min_avail = 20
> }
> service imap {
>   executable = imap
> }
> service lmtp {
>   inet_listener lmtp {
>     address = 127.0.0.1
>     port = 24
>   }
> }
> service managesieve-login {
>   inet_listener sieve {
>     port = 4190
>   }
>   inet_listener sieve_deprecated {
>     port = 2000
>   }
> }
> service pop3-login {
>   inet_listener pop3s {
>     port = 995
>     ssl = yes
>   }
> }
> service pop3 {
>   executable = pop3
> }
> service replicator {
>   unix_listener replicator-doveadm {
>     mode = 0666
>   }
> }
> ssl = required
> ssl_cert = </etc/pki/dovecot/certs/mail.tutech.de.crt_chain
> ssl_cipher_list = ALL:!LOW:!SSLv2:!EXP:!aNULL:!EXPORT
> ssl_dh =  # hidden, use -P to show it
> ssl_key =  # hidden, use -P to show it
> syslog_facility = local6
> userdb {
>   args = /etc/dovecot/dovecot-ldap-userdb.conf.ext
>   driver = ldap
> }
> protocol lmtp {
>   mail_plugins = acl zlib mail_log notify sieve
> }
> protocol imap {
>   mail_max_userip_connections = 100
>   mail_plugins = acl zlib mail_log notify imap_zlib imap_acl
>   rawlog_dir = /tmp/rawlog/%u
> }
>